javascript常用函数

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Javascript常用函数及基本教材集合

 

每一项都是js使用中的小技巧,基础但十分的实用!

1.document.write(""); 输出语句

2.JS中的注释为//

3.传统的HTML文档顺序是:

document->html->(head,body)

4.一个浏览器窗口中的DOM顺序是:

window->(navigator,screen,history,location,document)

5.得到表单中元素的名称和值:

document.getElementById("表单中元素的ID号").name(或value)

6.一个小写转大写的JS:

document.getElementById("output").value=document.getElementById("input").value.toUpperCase();

7.JS中的值类型:

String,Number,Boolean,Null,Object,Function

8.JS中的字符型转换成数值型:

parseInt(),parseFloat()

9.JS中的数字转换成字符型:

("" 变量)

10.JS中的取字符串长度是:

(length)

11.JS中的字符与字符相连接使用 号.

12.JS中的比较操作符有:

==等于,!=不等于,>,>=,<.<=

13.JS中声明变量使用:

var来进行声明

14.JS中的判断语句结构:

if(condition){}else{}

15.JS中的循环结构:

for([initial expression];[condition];[upadte expression]) {insideloop}

16.循环中止的命令是:

break

17.JS中的函数定义:

function functionName([parameter],…){statement[s]}

18.当文件中出现多个form表单时.可以用document.forms[0],document.forms[1]来代替.

19.窗口:

打开窗口window.open(), 关闭一个窗口:window.close(), 窗口本身:self

20.状态栏的设置:

window.status="字符";

21.弹出提示信息:

window.alert("字符");

22.弹出确认框:

window.confirm();

23.弹出输入提示框:

window.prompt();

24.指定当前显示链接的位置:

window.location.href="URL"

25.取出窗体中的所有表单的数量:

document.forms.length

26.关闭文档的输出流:

document.close();

27.字符串追加连接符: =

28.创建一个文档元素:

document.createElement(),document.createTextNode()

29.得到元素的方法:

document.getElementById()

30.设置表单中所有文本型的成员的值为空:

var form = window.document.forms[0]

for (var i = 0; i<form.elements.length;i ){

if (form.elements.type == "text"){

form.elements.value = "";

}

}

31.复选按钮在JS中判断是否选中:

document.forms[0].checkThis.checked

(checked属性代表为是否选中返回TRUE或FALSE)

32.单选按钮组(单选按钮的名称必须相同):

取单选按钮组的长度document.forms[0].groupName.length

33.单选按钮组判断是否被选中也是用checked.

34.下拉列表框的值:

document.forms[0].selectName.options[n].value

(n有时用下拉列表框名称加上.selectedIndex来确定被选中的值)

35.字符串的定义:

var myString = new String("This is lightsword");

36.字符串转成大写:

string.toUpperCase(); 字符串转成小写:string.toLowerCase();

37.返回字符串2在字符串1中出现的位置:

String1.indexOf("String2")!=-1则说明没找到.

38.取字符串中指定位置的一个字符:

StringA.charAt(9);

39.取出字符串中指定起点和终点的子字符串:

stringA.substring(2,6);

40.数学函数:

Math.PI(返回圆周率),Math.SQRT2(返回开方),Math.max(value1,value2)返回两个数中的

最在值,Math.pow(value1,10)返回value1的十次方,Math.round(value1)四舍五入函数,

Math.floor(Math.random()*(n 1))返回随机数

41.定义日期型变量:

var today = new Date();

42.日期函数列表:

dateObj.getTime()得到时间,dateObj.getYear()得到年份,dateObj.getFullYear()得到四位的年份,

dateObj.getMonth()得到月份,dateObj.getDate()得到日,dateObj.getDay()得到日期几,

dateObj.getHours()得到小时,dateObj.getMinutes()得到分,dateObj.getSeconds()得到秒,

dateObj.setTime(value)设置时间,dateObj.setYear(val)设置年,

dateObj.setMonth(val)设置月,dateObj.setDate(val)设置日,

dateObj.setDay(val)设置星期几,dateObj.setHours设置小时,dateObj.setMinutes(val)设置分,

dateObj.setSeconds(val)设置秒 [注意:此日期时间从0开始计]

43.FRAME的表示方式:

[window.]frames[n].ObjFuncVarName,frames["frameName"].ObjFuncVarName,frameName.ObjFuncVarName

44.parent代表父亲对象,top代表最顶端对象

45.打开子窗口的父窗口为:opener

46.表示当前所属的位置:this

47.当在超链接中调用JS函数时用:(javascript :)来开头后面加函数名

48.在老的浏览器中不执行此JS:<!– //–>

49.引用一个文件式的JS:<scripttype="text/javascript" src="aaa.js"></script>

50.指定在不支持脚本的浏览器显示的HTML:<noscript></noscript>

51.当超链和onCLICK事件都有时,则老版本的浏览器转向a.html,否则转向b.html.

例:<a href="a.html"onclick="location.href='b.html';return false">dfsadf</a>

52.JS的内建对象有:

Array,Boolean,Date,Error,EvalError,

Function,Math,Number,Object,RangeError,ReferenceError,

RegExp,String,SyntaxError,TypeError,URIError

53.JS中的换行:\n

54.窗口全屏大小:

<script>function fullScreen(){ this.moveTo(0,0);this.outerWidth=screen.availWidth;

this.outerHeight=screen.availHeight;}window.maximize=fullScreen;</script>

55.JS中的all代表其下层的全部元素

56.JS中的焦点顺序:document.getElementByid("表单元素").tabIndex = 1

57.innerHTML的值是表单元素的值:

如<pid="para">"how are <em>you</em>"</p>,则innerHTML的值就是:how are<em>you</em>

58.innerTEXT的值和上面的一样,只不过不会把<em>这种标记显示出来.

59.contentEditable可设置元素是否可被修改,isContentEditable返回是否可修改的状态.

60.isDisabled判断是否为禁止状态.disabled设置禁止状态

61.length取得长度,返回整型数值

62.addBehavior()是一种JS调用的外部函数文件其扩展名为.htc

63.window.focus()使当前的窗口在所有窗口之前.

64.blur()指失去焦点.与FOCUS()相反.

65.select()指元素为选中状态.

66.防止用户对文本框中输入文本:

onfocus="this.blur()"

67.取出该元素在页面中出现的数量:

document.all.tags("div(或其它HTML标记符)").length

68.JS中分为两种窗体输出:模态和非模态.

window.showModaldialog(),window.showModeless()

69.状态栏文字的设置:

window.status='文字',默认的状态栏文字设置:window.defaultStatus= '文字.';

70.添加到收藏夹:

external.AddFavorite("http://www.dannyg.com";,"jaskdlf");

71.JS中遇到脚本错误时不做任何操作:

window.onerror = doNothing; 指定错误句柄的语法为:window.onerror = handleError;

72.JS中指定当前打开窗口的父窗口:

window.opener,支持opener.opener…的多重继续.

73.JS中的self指的是当前的窗口

74.JS中状态栏显示内容:window.status="内容"

75.JS中的top指的是框架集中最顶层的框架

76.JS中关闭当前的窗口:window.close();

77.JS中提出是否确认的框:if(confirm("Areyou sure?")){alert("ok");}else{alert("Not Ok");}

78.JS中的窗口重定向:window.navigate("http://www.sina.com.cn";);

79.JS中的打印:window.print()

80.JS中的提示输入框:window.prompt("message","defaultReply");

81.JS中的窗口滚动条:window.scroll(x,y)

82.JS中的窗口滚动到位置:window.scrollby

83.JS中设置时间间隔:setInterval("expr",msecDelay)或setInterval(funcRef,msecDelay)或setTimeout

84.JS中的模态显示在IE4 行,在NN中不行:showModalDialog("URL"[,arguments][,features]);

85.JS中的退出之前使用的句柄:

function verifyClose(){event.returnValue="we really like youand hope you will stay longer.";}} window.=verifyClose;

86.当窗体第一次调用时使用的文件句柄:onload()

87.当窗体关闭时调用的文件句柄:onunload()

88.window.location的属性:

protocol(http:),hostname(www.example.com),port(80),host(www.example.com:80),

pathname("/a/a.html"),hash("#giantGizmo",指跳转到相应的锚记),href(全部的信息)

89.window.location.reload()刷新当前页面.

90.window.history.back()返回上一页,window.history.forward()返回下一页,

window.history.go(返回第几页,也可以使用访问过的URL)

91.document.write()不换行的输出,document.writeln()换行输出

92.document.body.noWrap=true;防止链接文字折行.

93.变量名.charAt(第几位),取该变量的第几位的字符.

94."abc".charCodeAt(第几个),返回第几个字符的ASCii码值.

95.字符串连接:string.concat(string2),或用 =进行连接

96.变量.indexOf("字符",起始位置),返回第一个出现的位置(从0开始计算)

97.string.lastIndexOf(searchString[,startIndex])最后一次出现的位置.

98.string.match(regExpression),判断字符是否匹配.

99.string.replace(regExpression,replaceString)替换现有字符串.

100.string.split(分隔符)返回一个数组存储值.

101.string.substr(start[,length])取从第几位到指定长度的字符串.

102.string.toLowerCase()使字符串全部变为小写.

103.string.toUpperCase()使全部字符变为大写.

104.parseInt(string[,radix(代表进制)])强制转换成整型.

105.parseFloat(string[,radix])强制转换成浮点型.

106.isNaN(变量):测试是否为数值型.

107.定义常量的关键字:const,定义变量的关键字:var

 

 

 

教程:JavaScript就这么回事1-5 

 

有些时候你精通一门语言,但是会发现你其实整天在和其它语言打交道,也许你以为这些微不足道,不至于影响你的开发进度,但恰恰是这些你不重视的东西会浪费你很多时间,我一直以为我早在几年前就已经精通JavaScript了,直到目前,我才越来越觉得JavaScript远比我想象的复杂和强大,我开始崇拜它,就像崇拜所有OOP语言一样~

趁着节日的空隙,把有关JavaScript的方法和技巧整理下,让每个在为JavaScript而烦恼的人明白,JavaScript就这么回事!并希望JavaScript还可以成为你的朋友,让你豁然开朗,在项目中更好的应用~

 

适合阅读范围:对JavaScript一无所知~离精通只差一步之遥的人

基础知识:HTML

 

JavaScript就这么回事1:基础知识

 

1 创建脚本块

 

1: <script language=”JavaScript”>

2: JavaScript code goes here

3: </script>

 

2 隐藏脚本代码

 

1: <script language=”JavaScript”>

2: <!–

3: document.write(“Hello”);

4: // –>

5: </script>

 

在不支持JavaScript的浏览器中将不执行相关代码

 

3 浏览器不支持的时候显示

 

1: <noscript>

2: Hello to the non-JavaScript browser.

3: </noscript>

 

4 链接外部脚本文件

 

1: <script language=”JavaScript”src="/”filename.js"”></script>

 

5 注释脚本

 

1: // This is a comment

2: document.write(“Hello”); // This is acomment

3: /*

4: All of this

5: is a comment

6: */

 

6 输出到浏览器

 

1:document.write(“<strong>Hello</strong>”);

 

7 定义变量

 

1: var myVariable = “some value”;

 

8 字符串相加

 

1: var myString = “String1” + “String2”;

 

9 字符串搜索

 

1: <script language=”JavaScript”>

2: <!–

3: var myVariable = “Hello there”;

4: var therePlace =myVariable.search(“there”);

5: document.write(therePlace);

6: // –>

7: </script>

 

10 字符串替换

 

1: thisVar.replace(“Monday”,”Friday”);

 

11 格式化字串

 

1: <script language=”JavaScript”>

2: <!–

3: var myVariable = “Hello there”;

4: document.write(myVariable.big() +“<br>”);

5: document.write(myVariable.blink() +“<br>”);

6: document.write(myVariable.bold() +“<br>”);

7: document.write(myVariable.fixed() +“<br>”);

8: document.write(myVariable.fontcolor(“red”)+ “<br>”);

9:document.write(myVariable.fontsize(“18pt”) + “<br>”);

10: document.write(myVariable.italics() +“<br>”);

11: document.write(myVariable.small() +“<br>”);

12: document.write(myVariable.strike() +“<br>”);

13: document.write(myVariable.sub() +“<br>”);

14: document.write(myVariable.sup() +“<br>”);

15: document.write(myVariable.toLowerCase()+ “<br>”);

16: document.write(myVariable.toUpperCase()+ “<br>”);

17:

18: var firstString = “My String”;

19: var finalString = firstString.bold().toLowerCase().fontcolor(“red”);

20: // –>

21: </script>

 

12 创建数组

 

1: <script language=”JavaScript”>

2: <!–

3: var myArray = new Array(5);

4: myArray[0] = “First Entry”;

5: myArray[1] = “Second Entry”;

6: myArray[2] = “Third Entry”;

7: myArray[3] = “Fourth Entry”;

8: myArray[4] = “Fifth Entry”;

9: var anotherArray = new Array(“FirstEntry”,”Second Entry”,”Third Entry”,”Fourth Entry”,”Fifth Entry”);

10: // –>

11: </script>

 

13 数组排序

 

1: <script language=”JavaScript”>

2: <!–

3: var myArray = new Array(5);

4: myArray[0] = “z”;

5: myArray[1] = “c”;

6: myArray[2] = “d”;

7: myArray[3] = “a”;

8: myArray[4] = “q”;

9: document.write(myArray.sort());

10: // –>

11: </script>

 

14 分割字符串

 

1: <script language=”JavaScript”>

2: <!–

3: var myVariable = “a,b,c,d”;

4: var stringArray = myVariable.split(“,”);

5: document.write(stringArray[0]);

6: document.write(stringArray[1]);

7: document.write(stringArray[2]);

8: document.write(stringArray[3]);

9: // –>

10: </script>

 

15 弹出警告信息

 

1: <script language=”JavaScript”>

2: <!–

3: window.alert(“Hello”);

4: // –>

5: </script>

 

16 弹出确认框

 

1: <script language=”JavaScript”>

2: <!–

3: var result = window.confirm(“Click OK tocontinue”);

4: // –>

5: </script>

 

17 定义函数

 

1: <script language=”JavaScript”>

2: <!–

3: function multiple(number1,number2) {

4: var result = number1 * number2;

5: return result;

6: }

7: // –>

8: </script>

 

18 调用JS函数

 

1: <a href=”#”onClick=”functionName()”>Link text</a>

2: <ahref="/”javascript:functionName"()”>Link text</a>

 

19 在页面加载完成后执行函数

 

1: <body onLoad=”functionName();”>

2: Body of the page

3: </body>

 

20 条件判断

 

1: <script>

2: <!–

3: var userChoice = window.confirm(“ChooseOK or Cancel”);

4: var result = (userChoice == true) ? “OK”: “Cancel”;

5: document.write(result);

6: // –>

7: </script>

 

21 指定次数循环

 

1: <script>

2: <!–

3: var myArray = new Array(3);

4: myArray[0] = “Item 0”;

5: myArray[1] = “Item 1”;

6: myArray[2] = “Item 2”;

7: for (i = 0; i < myArray.length; i++){

8: document.write(myArray[i] +“<br>”);

9: }

10: // –>

11: </script>

 

22 设定将来执行

 

1: <script>

2: <!–

3: function hello() {

4: window.alert(“Hello”);

5: }

6: window.setTimeout(“hello()”,5000);

7: // –>

8: </script>

 

23 定时执行函数

 

1: <script>

2: <!–

3: function hello() {

4: window.alert(“Hello”);

5: window.setTimeout(“hello()”,5000);

6: }

7: window.setTimeout(“hello()”,5000);

8: // –>

9: </script>

 

24 取消定时执行

 

1: <script>

2: <!–

3: function hello() {

4: window.alert(“Hello”);

5: }

6: var myTimeout =window.setTimeout(“hello()”,5000);

7: window.clearTimeout(myTimeout);

8: // –>

9: </script>

 

25 在页面卸载时候执行函数

 

1: <body onUnload=”functionName();”>

2: Body of the page

3: </body>

 

JavaScript就这么回事2:浏览器输出

 

26 访问document对象

 

1: <script language=”JavaScript”>

2: var myURL = document.URL;

3: window.alert(myURL);

4: </script>

 

27 动态输出HTML

 

1: <script language=”JavaScript”>

2: document.write(“<p>Here’s some informationabout this document:</p>”);

3: document.write(“<ul>”);

4: document.write(“<li>ReferringDocument: “ + document.referrer + “</li>”);

5: document.write(“<li>Domain: “ +document.domain + “</li>”);

6: document.write(“<li>URL: “ +document.URL + “</li>”);

7: document.write(“</ul>”);

8: </script>

 

28 输出换行

 

1:document.writeln(“<strong>a</strong>”);

2: document.writeln(“b”);

 

29 输出日期

 

1: <script language=”JavaScript”>

2: var thisDate = new Date();

3: document.write(thisDate.toString());

4: </script>

 

30 指定日期的时区

 

1: <script language=”JavaScript”>

2: var myOffset = -2;

3: var currentDate = new Date();

4: var userOffset =currentDate.getTimezoneOffset()/60;

5: var timeZoneDifference = userOffset -myOffset;

6:currentDate.setHours(currentDate.getHours() + timeZoneDifference);

7: document.write(“The time and date inCentral Europe is: “ + currentDate.toLocaleString());

8: </script>

 

31 设置日期输出格式

 

1: <script language=”JavaScript”>

2: var thisDate = new Date();

3: var thisTimeString = thisDate.getHours()+ “:” + thisDate.getMinutes();

4: var thisDateString =thisDate.getFullYear() + “/” + thisDate.getMonth() + “/” + thisDate.getDate();

5: document.write(thisTimeString + “ on “ +thisDateString);

6: </script>

 

32 读取URL参数

 

1: <script language=”JavaScript”>

2: var urlParts = document.URL.split(“?”);

3: var parameterParts =urlParts[1].split(“&”);

4: for (i = 0; i <parameterParts.length; i++) {

5: var pairParts =parameterParts[i].split(“=”);

6: var pairName = pairParts[0];

7: var pairValue = pairParts[1];

8: document.write(pairName + “ :“ +pairValue );

9: }

10: </script>

 

你还以为HTML是无状态的么?

 

33 打开一个新的document对象

 

1: <script language=”JavaScript”>

2: function newDocument() {

3: document.open();

4: document.write(“<p>This is a NewDocument.</p>”);

5: document.close();

6: }

7: </script>

 

34 页面跳转

 

1: <script language=”JavaScript”>

2: window.location = “http://www.velee.cn”;

3: </script>

 

35 添加网页加载进度窗口

 

1: <html>

2: <head>

3: <script language='javaScript'>

4: var placeHolder =window.open('holder.html','placeholder','width=200,height=200');

5: </script>

6: <title>The Main Page</title>

7: </head>

8: <bodyonLoad='placeHolder.close()'>

9: <p>This is the main page</p>

10: </body>

11: </html>

 

JavaScript就这么回事3:图像

 

36 读取图像属性

 

1: <img src="/”image1.jpg"”name=”myImage”>

2: <a href=”# ”onClick=”window.alert(document.myImage.width)”>Width</a>

3:

 

37 动态加载图像

 

1: <script language=”JavaScript”>

2: myImage = new Image;

3: myImage.src = “Tellers1.jpg”;

4: </script>

 

38 简单的图像替换

 

1: <script language=”JavaScript”>

2: rollImage = new Image;

3: rollImage.src = “rollImage1.jpg”;

4: defaultImage = new Image;

5: defaultImage.src = “image1.jpg”;

6: </script>

7: <a href="/”myUrl"”onMouseOver=”document.myImage.src = rollImage.src;”

8: onMouseOut=”document.myImage.src =defaultImage.src;”>

9: <img src="/”image1.jpg"”name=”myImage” width=100 height=100 border=0>

 

39 随机显示图像

 

1: <script language=”JavaScript”>

2: var imageList = new Array;

3: imageList[0] = “image1.jpg”;

4: imageList[1] = “image2.jpg”;

5: imageList[2] = “image3.jpg”;

6: imageList[3] = “image4.jpg”;

7: var imageChoice =Math.floor(Math.random() * imageList.length);

8: document.write(‘<img src=”’ + imageList[imageChoice]+ ‘“>’);

9: </script>

 

40 函数实现的图像替换

 

1: <script language=”JavaScript”>

2: var source = 0;

3: var replacement = 1;

4: functioncreateRollOver(originalImage,replacementImage) {

5: var imageArray = new Array;

6: imageArray[source] = new Image;

7: imageArray[source].src = originalImage;

8: imageArray[replacement] = new Image;

9: imageArray[replacement].src =replacementImage;

10: return imageArray;

11: }

12: var rollImage1 =createRollOver(“image1.jpg”,”rollImage1.jpg”);

13: </script>

14: <a href=”#”onMouseOver=”document.myImage1.src = rollImage1[replacement].src;”

15: onMouseOut=”document.myImage1.src =rollImage1[source].src;”>

16: <img src="/”image1.jpg"”width=100 name=”myImage1” border=0>

17: </a>

 

41 创建幻灯片

 

1: <script language=”JavaScript”>

2: var imageList = new Array;

3: imageList[0] = new Image;

4: imageList[0].src = “image1.jpg”;

5: imageList[1] = new Image;

6: imageList[1].src = “image2.jpg”;

7: imageList[2] = new Image;

8: imageList[2].src = “image3.jpg”;

9: imageList[3] = new Image;

10: imageList[3].src = “image4.jpg”;

11: function slideShow(imageNumber) {

12: document.slideShow.src =imageList[imageNumber].src;

13: imageNumber += 1;

14: if (imageNumber < imageList.length){

15: window.setTimeout(“slideShow(“ +imageNumber + “)”,3000);

16: }

17: }

18: </script>

19: </head>

20: <body onLoad=”slideShow(0)”>

21: <img src="/”image1.jpg"”width=100 name=”slideShow”>

 

42 随机广告图片

 

1: <script language=”JavaScript”>

2: var imageList = new Array;

3: imageList[0] = “image1.jpg”;

4: imageList[1] = “image2.jpg”;

5: imageList[2] = “image3.jpg”;

6: imageList[3] = “image4.jpg”;

7: var urlList = new Array;

8: urlList[0] = “http://some.host/”;

9: urlList[1] = “http://another.host/”;

10: urlList[2] = “http://somewhere.else/”;

11: urlList[3] = “http://right.here/”;

12: var imageChoice =Math.floor(Math.random() * imageList.length);

13: document.write(‘<a href=”’ +urlList[imageChoice] + ‘“><img src=”’ + imageList[imageChoice] +‘“></a>’);

14: </script>

 

JavaScript就这么回事4:表单

 

还是先继续写完JS就这么回事系列吧~

43 表单构成

 

1: <form method=”post”action=”target.html” name=”thisForm”>

2: <input type=”text” name=”myText”>

3: <select name=”mySelect”>

4: <option value=”1”>FirstChoice</option>

5: <option value=”2”>SecondChoice</option>

6: </select>

7: <br>

8: <input type=”submit” value=”SubmitMe”>

9: </form>

 

44 访问表单中的文本框内容

 

1: <form name=”myForm”>

2: <input type=”text” name=”myText”>

3: </form>

4: <a href='#'onClick='window.alert(document.myForm.myText.value);'>Check TextField</a>

 

45 动态复制文本框内容

 

1: <form name=”myForm”>

2: Enter some Text: <input type=”text”name=”myText”><br>

3: Copy Text: <input type=”text”name=”copyText”>

4: </form>

5: <a href=”#”onClick=”document.myForm.copyText.value =

6: document.myForm.myText.value;”>CopyText Field</a>

 

46 侦测文本框的变化

 

1: <form name=”myForm”>

2: Enter some Text: <input type=”text”name=”myText” onChange=”alert(this.value);”>

3: </form>

 

47 访问选中的Select

 

1: <form name=”myForm”>

2: <select name=”mySelect”>

3: <option value=”FirstChoice”>1</option>

4: <option value=”SecondChoice”>2</option>

5: <option value=”ThirdChoice”>3</option>

6: </select>

7: </form>

8: <a href='#'onClick='alert(document.myForm.mySelect.value);'>Check SelectionList</a>

 

48 动态增加Select项

 

1: <form name=”myForm”>

2: <select name=”mySelect”>

3: <option value=”FirstChoice”>1</option>

4: <option value=”SecondChoice”>2</option>

5: </select>

6: </form>

7: <script language=”JavaScript”>

8: document.myForm.mySelect.length++;

9:document.myForm.mySelect.options[document.myForm.mySelect.length - 1].text =“3”;

10:document.myForm.mySelect.options[document.myForm.mySelect.length - 1].value =“Third Choice”;

11: </script>

 

49 验证表单字段

 

1: <script language=”JavaScript”>

2: function checkField(field) {

3: if (field.value == “”) {

4: window.alert(“You must enter a value inthe field”);

5: field.focus();

6: }

7: }

8: </script>

9: <form name=”myForm”action=”target.html”>

10: Text Field: <input type=”text”name=”myField”onBlur=”checkField(this)”>

11: <br><input type=”submit”>

12: </form>

 

50 验证Select项

 

1: function checkList(selection) {

2: if (selection.length == 0) {

3: window.alert(“You must make a selectionfrom the list.”);

4: return false;

5: }

6: return true;

7: }

 

51 动态改变表单的action

 

1: <form name=”myForm”action=”login.html”>

2: Username: <input type=”text”name=”username”><br>

3: Password: <input type=”password”name=”password”><br>

4: <input type=”button” value=”Login”onClick=”this.form.submit();”>

5: <input type=”button” value=”Register”onClick=”this.form.action = ‘register.html’; this.form.submit();”>

6: <input type=”button” value=”RetrievePassword” onClick=”this.form.action = ‘password.html’; this.form.submit();”>

7: </form>

 

52 使用图像按钮

 

1: <form name=”myForm”action=”login.html”>

2: Username: <input type=”text”name=”username”><br>

3: Password: <inputtype=”password”name=”password”><br>

4: <input type=”image”src="/”login.gif"” value=”Login”>

5: </form>

6:

 

53 表单数据的加密

 

1: <SCRIPT LANGUAGE='JavaScript'>

2: <!–

3: function encrypt(item) {

4: var newItem = '';

5: for (i=0; i < item.length; i++) {

6: newItem += item.charCodeAt(i) + '.';

7: }

8: return newItem;

9: }

10: function encryptForm(myForm) {

11: for (i=0; i < myForm.elements.length;i++) {

12: myForm.elements[i].value =encrypt(myForm.elements[i].value);

13: }

14: }

15:

16: //–>

17: </SCRIPT>

18: <form name='myForm'onSubmit='encryptForm(this); window.alert(this.myField.value);'>

19: Enter Some Text: <input type=textname=myField><input type=submit>

20: </form>

 

JavaScript就这么回事5:窗口和框架

 

54 改变浏览器状态栏文字提示

 

1: <script language=”JavaScript”>

2: window.status = “A new status message”;

3: </script>

 

55 弹出确认提示框

 

1: <script language=”JavaScript”>

2: var userChoice = window.confirm(“ClickOK or Cancel”);

3: if (userChoice) {

4: document.write(“You chose OK”);

5: } else {

6: document.write(“You chose Cancel”);

7: }

8: </script>

 

56 提示输入

 

1: <script language=”JavaScript”>

2: var userName = window.prompt(“PleaseEnter Your Name”,”Enter Your Name Here”);

3: document.write(“Your Name is “ +userName);

4: </script>

 

57 打开一个新窗口

 

1: //打开一个名称为myNewWindow的浏览器新窗口

2: <script language=”JavaScript”>

3:window.open(“http://www.velee.cn”,”myNewWindow”);

4: </script>

 

58 设置新窗口的大小

 

1: <script language=”JavaScript”>

2:window.open(“http://www.velee.cn”,”myNewWindow”,'height=300,width=300');

3: </script>

 

59 设置新窗口的位置

 

1: <script language=”JavaScript”>

2:window.open(“http://www.velee.cn”,”myNewWindow”,'height=300,width=300,left=200,screenX=200,top=100,screenY=100');

3: </script>

 

60 是否显示工具栏和滚动栏

 

1: <script language=”JavaScript”>

2: window.open(“http:

 

61 是否可以缩放新窗口的大小

 

1: <script language=”JavaScript”>

2: window.open('http://www.velee.cn' ,'myNewWindow', 'resizable=yes' );</script>

 

62 加载一个新的文档到当前窗口

 

1: <a href='#'onClick='document.location = '125a.html';' >Open New Document</a>

 

63 设置页面的滚动位置

 

1: <script language=”JavaScript”>

2: if (document.all) { //如果是IE浏览器则使用scrollTop属性

3: document.body.scrollTop = 200;

4: } else { //如果是NetScape浏览器则使用pageYOffset属性

5: window.pageYOffset = 200;

6: }</script>

 

64 在IE中打开全屏窗口

 

1: <a href='#'onClick=”window.open('http://www.juxta.com/','newWindow','fullScreen=yes');”>Opena full-screen window</a>

 

65 新窗口和父窗口的操作

 

1: <script language=”JavaScript”>

2: //定义新窗口

3: var newWindow =window.open(“128a.html”,”newWindow”);

4: newWindow.close(); //在父窗口中关闭打开的新窗口

5: </script>

6: 在新窗口中关闭父窗口

7: window.opener.close()

 

66 往新窗口中写内容

 

1: <script language=”JavaScript”>

2: var newWindow =window.open(“”,”newWindow”);

3: newWindow.document.open();

4: newWindow.document.write(“This is a newwindow”);

5: newWIndow.document.close();

6: </script>

 

67 加载页面到框架页面

 

1: <frameset cols=”50%,*”>

2: <frame name=”frame1”src="/”135a.html"”>

3: <frame name=”frame2”src="/”about:blank"”>

4: </frameset>

5: 在frame1中加载frame2中的页面

6: parent.frame2.document.location =“135b.html”;

 

68 在框架页面之间共享脚本

如果在frame1中html文件中有个脚本

 

1: function doAlert() {

2: window.alert(“Frame 1 is loaded”);

3: }

 

那么在frame2中可以如此调用该方法

 

1: <body onLoad=”parent.frame1.doAlert();”>

2: This is frame 2.

3: </body>

 

69 数据公用

可以在框架页面定义数据项,使得该数据可以被多个框架中的页面公用

 

1: <script language=”JavaScript”>

2: var persistentVariable = “This is apersistent value”;

3: </script>

4: <frameset cols=”50%,*”>

5: <frame name=”frame1”src="/”138a.html"”>

6: <frame name=”frame2”src="/”138b.html"”>

7: </frameset>

 

这样在frame1和frame2中都可以使用变量persistentVariable

70 框架代码库

根据以上的一些思路,我们可以使用一个隐藏的框架页面来作为整个框架集的代码库

 

1: <frameset cols=”0,50%,*”>

2: <frame name=”codeFrame”src="/”140code.html"”>

3: <frame name=”frame1” src="/”140a.html"”>

4: <frame name=”frame2”src="/”140b.html"”>

5: </frameset>

 

 

 

教程:事半功倍系列之javascriptFrom:向东IT博客

本文由经典论坛 邓永炎整理

 

清华大学出版的《事半功倍系列javascript》,本人照着书敲出来的,有些翻译了一下.前几年看了一下,最近无事,重新翻了翻,很有帮助.本书应该有光盘的,但学校的书,光盘不知在哪.希望对你学javascript有帮助

 

第一章javascript简介

 

1.在地址栏输入javascript语句

 

Javascript:Document.write("显示文字")

 

2.将javascript嵌入 HTML文档

 

<script language=javascript>

document.bgColor="blue"

</script>

 

第二章 使用变量和数组

 

1.声明变量

 

<script language=javascripe>

Var answer1,answer2,answer3,answer4;

answer1=9;

answer2=2.5

answer3="Milkey May"

answer4=true

</script>

 

2.使用整数

 

<script language=javascript>

var decimalNum,hexadecimalNum,octalNum

decimalNum=24

hexadecimalNum=0×24

octalNum=024

document.write("显示十进制数:"+decimalNum+"<br>")

document.write("显示十六进制数:"+ hexadecimalNum+"<br>")

document.write("显示八进制数:"+ octalNum+"<br>")

</script>

 

3.使用浮点数

 

<script language=javascript>

var num1,num2,num3,num4

num1=1234567890000.0

num2=5.14e23

num3=0.0000123456

num4=6.0254e3-4

document.write("浮点数1:"+num1+"<br>")

document.write("浮点数2:"+num2+"<br>")

document.write("浮点数3:"+num3+"<br>")

document.write("浮点数4:"+num4+"<br>")

</script>

 

4.使用布尔值

 

<script language=javascript>

var answer1,answer2

answer1=true

answer2=false

document.write("显示布尔1:"+answer1+"<br>")

document.write("显示布尔2:"+answer2+"<br>")

</script>

 

5.使用字符串

 

<script language=javascript>

var str1,str2

str1="fdsgdg dsfdsf china"

str2="武汉市广播电视大学"

document.write("显示字符串1:"+str1+"<br>")

document.write("显示字符串2:"+str2+"<br>")

</script>

 

6.确定变量类型

 

<script>

var answer1,answer2,answer3,answer4

answer1=9

answer2=2.5

answer3="milky may"

answer4=true

document.write("变量1的类型是:"+typeof answer1 +"<br>")

document.write("变量2的类型是:"+typeof answer2 +"<br>")

document.write("变量3的类型是:"+typeof answer3 +"<br>")

document.write("变量4的类型是:"+typeof answer4 +"<br>")

</script>

 

7.将字符串转换成数字

 

<script>

var str1="31 days in january"

var int1=parseInt(str1)

document.write("str1的数据类型是 :"+typeof str1+"<br>")

document.write("int1的数据类型是 :"+typeof int1+"<br>")

</script>

 

8.将数字转换成字符串

 

<script>

var int1=256

var str1=""+int1

document.write("str1的数据类型是 :"+typeof str1+"<br>")

document.write("int1的数据类型是 :"+typeof int1+"<br>")

</script>

 

9.声明数组

 

<script>

array=new Array(5)

array[0]=1

array[1]=3

array[2]=5

array[3]=7

array[4]=11

document.write("数组是:"+array[0]+" "+array[1]+""+array[2]+" "+array[3]+" "+array[4])

</script>

 

10.确定数组元素的个数

 

<script>

array=new Array(5)

array[0]=1

array[1]=3

array[2]=5

array[3]=7

array[4]=11

document.write("数组是:"+array[0]+""+array[1]+" "+array[2]+" "+array[3]+""+array[4]+"<br>")

document.write("数组的元素个数是"+array.length)

</script>

 

11.将数组转换为字符串

 

<script>

array=new Array()

array[0]="dark"

array[1]="apple"

array[2]="nebula"

array[3]="water"

str1=array.join()

str2=array.join(" ")

document.write(str1+"<br>")

document.write(str2)

</script>

 

12.对数组排序

 

<script>

array=new Array()

array[0]="dark"

array[1]="apple"

array[2]="nebula"

array[3]="water"

str1=array.sort()

document.write(str1+"<br>")

</script>

 

第三章 创建表达式

 

1.使用算术运算符

 

<script>

var1=12

var2=10

varadd=var1+var2

varsub=var1-var2

varmult=var1*var2

vardiv=var1/var2

varmod=var1%var2

document.write("数据1是:"+var1+"<br>")

document.write("数据2是:"+var2+"<br>")

document.write("数据相加是:"+varadd+"<br>")

document.write("数据相减是:"+varsub+"<br>")

document.write("数据相乘是:"+varmult+"<br>")

document.write("数据相除是:"+vardiv+"<br>")

document.write("数据相除取余数是:"+varmod+"<br>")

</script>

 

2.递增变量和递减变量

 

<script>

days=1

document.write("输出变量"+days+"<br>")

days++

document.write("递增后变量变为:"+days)

</script>

 

3.创建比较表达式

 

<script>

daysofmonth=28

if(daysofmonth==28)

month="february"

document.write("days ofmonth:"+daysofmonth+"<br>")

document.write("month:"+month)

</script>

 

4.创建逻辑表达式

 

<script>

dayofmonth=28

if(dayofmonth==28 || dayofmonth==29)

month="february"

document.write("days ofmonth:"+dayofmonth+"<br>")

document.write("month:"+month)

</script>

 

5.使用条件运算符

 

<scriptlanguage="javascript">

stomach="hungry";

time="5:00";

(stomach=="hungry"&&time=="5:00")? eat = "dinner":eat="a snack";

document.write("输出结果"+eat);

</script>

 

6.识别数字

 

<script>

var1=24;

(isNaN(var1))?document.write("变量var1"+var1+"不是数字"):Document.write("变量var1"+var1+"是数字")

</script>

 

第四章 控制程序流程

 

1.使用IF –Else语句

 

<script>

month="december"

date=25

if(month=="december" &&date==25)

document.write("今天是圣诞节,商店关门")

else

document.write("欢迎,您来商店购物")

</script>

 

2.使用for 循环

 

<script>

for (count=1;count<=10;count++)

document.write("输出第"+count+"句"+"<br>")

</script>

 

3.使用while循环

 

<script>

count=1

while(count<=15){

document.write("输出第"+count+"句" +"<br>")

count++}

</script>

 

4.中断循环

 

<script>

count=1

while(count<=15){

count++

if(count==8)

break;

document.write("输出第"+count+"句"+"<br>")}

</script>

 

5.继续循环

 

<script>

count=1

while(count<=15){

count++

if(count==8)

continue;

document.write("输出第"+count+"句"+"<br>")}

</script>

 

6.使用javascript定时器

 

<script>

function rabbit()

{document.write("输出语句")

}

</script>

<bodyonload=window.setTimeout(rabbit(),5000)>

 

7.设置定期间隔

 

<script>

window.setInterval("document.form1.text2.value=document.form1.text1.value",3000)

</script>

<form name=form1>

<input type=textname=text1><br>

<input type=textname=text2><br>

</form>

 

8.清除超时和间隔

 

<script>

stop=window.setInterval("document.form1.text2.value=document.form1.text1.value",300)

</script>

<form name=form1>

<input type=textname=text1><br>

<input type=textname=text2><br>

<input type=button name=button1value=" 清除超时和间隔"onclick=clearInterval(stop)>

</form>

 

第五章 使用函数

 

1.声明函数

 

<script>

function quote()

{ document.write("输出语句")

}

</script>

 

2.调用函数

 

<script>

function quote()

{ document.write("输出语句")

}

quote()

</script>

 

3.了解全局变量和局部变量

 

任何不用 var关键字声明的变量都是全局变量,任何在函数外声明的变量都是全局变量

 

4.将参数传送给函数

 

<script>

function f(item)

{document.write("输出参数"+item+"<br>")

}

f("fgdfgd")

f("参数二")

</script>

 

5.从函数返回值

 

<script>

function average(var1,var2,var3)

{ave=(var1+var2+var3)/3;

document.write("输出结果");

return ave;

}

document.write(average(34,56,78))

</script>

 

6.通过HTML链接调用函数

 

<script>

function quote(){

document.write(" 输出字符串")

}

</script>

<a href=javascript:quote()>通过HTML链接调用函数</a>

<a href=javascript:Document.write("输出字符")> 通过HTML链接调用函数,直接写javascript语句</a>

 

第六章 处理事件

 

1.检查鼠标单击

 

<form name=form1>

<input type=button name=button1value=hello onclick=document.form1.button1.value='there'>

</form>

 

2.检测双击

 

<form name=form1>

<input type=button name=button1value=hello onclick=document.form1.button1.value='你单击了按钮' ondblclick=document.form1.button1.value='你双击了该按钮'>

</form>

 

3.创建悬停按钮

 

<img src=go.gifonmouseover=document.images[0].src='go2.gif' onmouseout=document.images[0].src='go.gif'>

 

4.检测按键

 

<form name=form1>

<input type=text name=text1 value=helloonkeypress="if(window.event.keyCode=='100') document.form1.text1.value='你按了d键'">

</form>

 

5.设置焦点

 

<form name=form1>

<input type=text name=text1 value=hello

onfous=document.form1.text1.value='该文本框获得焦点'

onblur=document.form1.text1.value='该文本框失去焦点'>

</form>

 

6.检测下拉菜单选择

 

<form name=form1>

<select name=select1 size=4

onChange=document.form1.text1.value=document.form1.select1.value>

<option value="北京">北京</option>

<option value="上海">上海</option>

<option value="武汉">武汉</option>

<option value="天津">天津</option>

<option value="大连">大连</option>

</select>

<input tppe=text name=text1value=hello>

</form>

 

7.创建网页加载和卸载信息

 

<bodyonload=document.form1.text1.value='页面加载完毕' onunload=alert('再见,欢迎再来')>

<form name=form1>

<input type=text name=text1 value="页面正在加载 ……">

</form>

 

第七章 使用对象

 

1.理解对象\属性和方法

 

<body bgcolor="green">

<script>

document.write("页面背景颜色是:"+document.bgColor)

document.write("页面前景颜色是:"+document.fgColor)

</script>

 

2.使用网页元素对象

 

<script>

</script>

<form name=form1>

<textareaname=ta1>dfgfdgfdhfdhdfdfgdf</textarea>

<input type=button value="选择文本"onclick=document.form1.ta1.select()>

<input type=button value="显示文本"onclick=document.write(document.form1.ta1.value)>

</form>

 

3.使用子对象

 

<form name=form1>

<input type=text name=text1value=hello>

</form>

<script>

document.form1.text1.value="gdfgfd"

</script>

 

<form name=form1>

<input type=radio name=radio1>男

<input type=radio name=radio2>女

</script>

<script>

document.form1.radio1.checked=true

</script>

 

4.使用预定义对象

 

<script>

str1="dgdfgdfgdfhf固定法固定法功夫攻打法"

document.write(str1+"<br>")

str2=str1.substr(5)

document.write(str2+"<br>")

document.write("输出圆的面积:"+Math.PI*Math.pow(5.0,2))

</script>

 

5.创建新对象

 

<script>

today=new Date()

document.write("今天是"+(today.getMonth()+1)+"月"+today.getDate()+"日"+"<br>")

document.write("现在是:"+today.toLocaleString())

</script>

 

6.引用当前对象

 

<form name=form1>

<input type=text name=text1value="dgdgdfgfd" onclick=this.select()>

</script>

 

7.查看对象属性

 

<script>

for(prop in window)

{document.write("window."+prop+"="+window[prop]+"<br>");}

for(prop2 in location)

{document.write("location."+prop2+"="+location[prop]+"<br>");}

</script>

 

8.使用Array对象

 

<script>

array=new Array(10)

array[0]="bark"

array[1]="apple"

array[2]="nebula"

array[3]="cookie"

array[4]="technology"

document.write("数组元素个数是"+array.Length+"<br>")

document.write("用 join将数组合并"+array.join(" ")+"<br>")

document.write(" 数组排序"+array.sort())

</script>

 

9.使用 image 对象

 

<img src=**.gif alt="图片提示…." border=10>

<script>

document.write("图片提示是:"+document.images[0].alt+"<br>")

document.write("图片边框大小是:"+document.images[0].broder)

</script>

 

10.预加载图像

 

<script>

freddy=new Image()

freddy.src=freddy.gif

</script>

<bodyonload=document.images[0].src=freddy.src>

,<img src="blank.gif">

</body>

 

11.改变图像

 

<img src=freddy.gif><br>

<form name=form1>

<input type=button name=button1value="改变图像"onclickd=document.images[0].src=dudjp.gif>

</form>

 

12.使用link和anchor对象

 

<a name=anchor1>锚点1<br>

<ahref=http://www.microsoft.com>Microsoft</a><br>

<ahref=http://www.sohu.com>sohu</a><br>

<ahref=http://www.sina.com.cn>sina</a><br>

<script>

document.write("本页面共有"+document.links.length+"链接"+"<br>")

document.write("本页面共有"+document.anchors.length+"锚点"+"<br>")

document.write("第一个链接协议是"+document.links[0].protocol+"<br>")

document.write("第一个链接路径是"+document.links[0].pathnamel+"<br>")

document.write("第一个链接href是"+document.links[0].hrefl+"<br>")

</script>

 

13.改变链接

 

<a href=http://www.microsoft.com>link</a>

<form name=form1>

<input type=button name=button1value="改变链接"onclick=document.links[0].href='http://www.sohu.com'>

</form>

 

14.使用history对象

 

<form name=form1>

<input type=button name=button1value="向后返回2页"onclick=window.history.go(-2)>

</form>

 

第八章 使用窗口

 

1.在浏览器的状态栏上显示文本

 

<body onload=window.status="欢迎光临我的站点">

<ahref=http://www.sohu.com>sohu</a>

</body>

 

2.改变背景色

 

<script>

document.bgColor="orange"

</script>

 

3.列举背景颜色

 

<body bgColor =green>

<script>

document.write("当前背景色是:"+document.bgColor)

</script>

</body>

 

4.改变文本和链接颜色

 

<script>

document.bgColor="orange"

document.fgColor="blue"

document.linkColor="red"

</script>

<h2>看看这段文本颜色</h2>

<ahref=http://www.sohu.com>sohu</a>

</body>

 

5.改变文档标题

 

<script>

name="Mouse"

document.title="welcome to"+name+"'s House"

document.write(document.title)

</script>

 

6.显示修改日期

 

<script>

document.write("本页面最后修改时间是"+document.lastModified)

</script>

 

7.查看当前文档的URL

 

<script>

document.write("本页面的URL:"+document.URL)

</script>

 

8.查看引用页

 

<script>

document.write("本页面的引用页是"+document.referrer)

</script>

 

9.打开新的浏览器窗口

 

<script>

window.open("*.htm","title","width=200,height=400,resizable=yes")

</script>

 

10.关闭远程窗口

 

close.html:

<script>

document.write("正文")

</script>

<form name=form1>

<input type=buttonname=button1value="关闭" onclick=window.close()>

</form>

 

open.html

<script>

window.open("close.html","romote","width=200,height=400,resizable=yes")

</script>

 

11.打印窗口

 

<script>

document.write("正文")

</script>

<form name=form1>

<input type=button value=打印 onclick=window.print()>

</form>

 

12.移动窗口

 

<form name=form1>

水平方向<inputtype=text name=x value=20>

垂直方向<inputtype=text name=y value=50>

<input type=button value="移动窗口到…"onclick=window.moveTo(document.form1.x.value,document.form1.y.value)>

</form>

 

<form name=form1>

水平方向<inputtype=text name=x value=20>

垂直方向<inputtype=text name=y value=50>

<input type=button value="移动窗口"onclick=window.moveBy(document.form1.x.value,document.form1.y.value)>

</form>

 

13.改变窗口大小

 

<form name=form1>

水平方向<inputtype=text name=x value=200>

垂直方向<inputtype=text name=y value=500>

<input type=button value="改变窗口大小到….."onclick=window.resizeTo(document.form1.x.value,document.form1.y.value)>

</form>

 

<form name=form1>

水平方向<inputtype=text name=x value=200>

垂直方向<inputtype=text name=y value=500>

<input type=button value="改变窗口大小"onclick=window.resizeBy(document.form1.x.value,document.form1.y.value)>

</form>

 

14.用警告对话框通知用户

 

<script>

window.alert("welcome")

</script>

 

15.用提示对话框接受输入

 

<script>

name=window.prompt("输入姓名","姓名")

document.write(" 欢迎您:"+name+"来到这里")

</script>

 

16.用确认对话框使用户做出决定

 

<script>

like=window.confirm("你觉得好吗?")

if(like==true)

document.write("谢谢你的夸奖")

else

document.write("希望得到你的夸奖")

</script>

 

第九章 使用字符串

 

1.使用字符串对象

 

<script>

mystring="gdgdfgfddddaaaaaaaaaaaabbbbbbbbbbbbbbbbbvbhg.<br>"

document.write(mystring)

document.write(mystring.bold())

document.write(mystring.toUpperCase())

</script>

 

2.使用子字符串

 

<script>

str1="fdsf 1111 gfdgfd dfdsf ccccdddd.<br>"

document.write(str1)

document.write(str1.substring(0,13)+"<br>")

document.write(str1.substr(20,11)+"<br>")

</script>

 

3.连接字符串

 

<script>

str1="may you find"

str2="peace,happiness andprosperity.<br>"

document.write(str1+"<br>")

document.write(str2)

document.write(str1.concat(str2))

document.write(str1+=str2)

</script>

 

4.格式化字符串变量

 

<script>

str1="peace,happiness andprosperity.<br>"

document.write(str1)

document.write(str1.big())

document.write(str1.small())

document.write(str1.bold())

document.write(str1.italics())

document.write(str1.strike())

document.write(str1.fontsize(6))

document.write(str1.fontcolor(green))

</script>

 

5.创建锚和链接

 

<script>

str1="this is the bigginning of thepage.<br>"

str2="….<br>"

str3="this is the end of the page.<br>"

str4="link to thestart<br>"

str5="link to the end<br>"

document.write(str1.anchor("start"))

for(i=0;i<10;i++)

document.write(str2);

document.write(str3.anchor("end"))

document.write(str4.link("#start"))

document.write(str5.link("#end"))

</script>

 

6.确定字符串长度

 

<script>

str1="this is the bigginning of thepage."

document.write(str1+"<br>")

document.write( "字符串的长度是:"+str1.length)

document.write("字符串全部大写是;"+str1.toUpperCase())

document.write("字符串全部小写是;"+str1.toLowerCase())

</script>

 

7.在字符串内搜索

 

<script>

str1="this is the end of theline.<br>"

document.write(str1)

document.write("字符end在字符串的位置是"+str1.search("end"))

document.write("字符dog在字符串的位置是"+str1.search("dog"))

</script>

 

8.定位字符串中的字符

 

<script>

str1="spring is a time for flowers andtrees and baby bunnles<br>"

document.write(str1)

document.write("the index for thesecond word ‘and' is"+str1.indexOf("and",30))

documednt.write("the last index of theword ‘and' is "+str1.lastIndexOf("and"))

</script>

 

9.替换字符串中的文本

 

<script>

str1="spring is a time for flowers andtrees and baby bunnles<br>"

document.write(str1)

document.write(str1.replace("and",","))

</script>

 

10.字符串分离

 

<script>

str1="spring is a time for flowers andtrees and baby bunnles<br>"

document.write(str1)

str1array=str1.split(" ")

document.write(str1array[0]+"<br>")

document.write(str1array[1]+"<br>")

document.write(str1array[2]+"<br>")

document.write(str1array[3]+"<br>")

</script>

 

第十章 使用日期和时间

 

1.使用Date对象

 

<script>

cdate=new Date("august 2,198912:30:00")

document.write(cdate)

</script>

 

2.显示当地时间和日期

 

<script>

cdate=new Date()

document.write("当前时间是:"+cdate.toGMTString()+"<br>")

document.write("日期和时间是:"+cdate.toLocaleString())

</script>

 

3.获得时间和日期值

 

<script>

cdate=new Date()

document.write("显示当前的星期"+cdate.getDay()+"<br>")

document.write("显示当前的月份"+cdate.getMonth()+"<br>")

document.write("显示当前的日期"+cdate.getDay()+"<br>")

document.write("显示当前的年份"+cdate.getYear()+"<br>")

document.write("显示当前的小时"+cdate.getHours()+"<br>")

document.write("显示当前的分钟"+cdate.getMinutes()+"<br>")

document.write("显示当前的秒"+cdate.getSeconds()+"<br>")

</script>

 

4.设置时间和日期值

 

<script language=javascript>

cdate=new Date("December25,1984")

document.write("显示日期"+cdate+"<br>")

document.write("设置月份"+cdate.setMonth(10)+"<br>")

document.write("设置日期"+cdate.setDate(23)+"<br>")

document.write("设置年份"+cdate.setYear(2000)+"<br>")

document.write("设置小时"+cdate.setHours(13)+"<br>");

document.write("设置分钟"+cdate.setMinutes(47)+"<br>");

document.write("设置秒"+cdate.setSeconds(23)+"<br>");

document.write("显示设置后的日期和时间"+cdate);

</script>

 

第十一章 使用Math对象

 

1. 使用Math对象

 

<script language=javascript>

</script>

<form name=form1>

圆的半径:<inputtype=text name=rad><br>

圆的面积:<inputtype=text name=area><br>

<input type=button name=button1 value=计算圆的面积onclick=document.form1.area.value=document.form1.rad.value*document.

form1.rad.value*Math.PI>

</form>

 

2.生成随机数

 

<script>

array1=new Array(

"这是第1句",

"这是第2句",

"这是第3句",

"这是第4句",

"这是第5句",

"这是第6句")

RandomNo=Math.floor(array1.length*Math.random())

document.write("随机输出某一句"+"<br>"+array1[RandomNo])

</script>

 

3.使用平方根

 

<form name=form1>

value:<input type=textname=va1><br>

平方根<inputtype=text name=sqrt><br>

<input type=button name=button1 value=计算平方根

onclick="document.form1.sqrt.value=Math.sqrt(document.form1.va1.value)">

</form>

 

4.数字的舍入

 

<form name=form1>

输入<inputtype=text name=val><br>

舍入的结果<inputtype=text name=round><br>

<input type=button name=button1 value=计算结果onclick=document.form1.round.value=Math.round(document.form1.val.value)>

</form>

 

5.乘方运算

 

<form name=form1>

底数<inputtype=text name=val><br>

指数<inputtype=text name=power><br>

幂<inputtype=text name=result><br>

<input type=button name=button1 value=计算结果onclick="document.form1.result.value=Math.pow(document.form1.val.value,document.form1.power.value)">

</form>

 

6.发现最小值和最大值

 

<form name=form1>

数字1<inputtype=text name=val1><br>

数字2<inputtype=text name=val2><br>

最小值<inputtype=text name=min><br>

最大值<inputtype=text name=max><br>

数字1<inputtype=button value=计算 onclick="document.form1.min.value=Math.min(document.form1.val1.value,document.form1.val2.value);document.form1.

max.value=Math.max(document.form1.val1.value,document.form1.val2.value)">

</form>

 

第十二章 使用表单

 

1.使用文本框

 

<form name=form1>

<input type=text value="information,please"name=text1>

</form>

<script>

document.write("表单text1类型是: "+document.form1.text1.type+"<br>")

document.write("表单text1名称是:"+document.form1.text1.name+"<br>")

document.write("表单text1值是:"+document.form1.text1.value+"<br>")

document.write("表单text1大小是:"+document.form1.text1.size+"<br>")

</script>

 

<form name=form1>

<input type=text name=text1 value=clickhere

onfocus=document.form1.text1.select()>

</form>

 

2.使用密码框

 

<form name=form1>

<input type=password name=pw1value=daylight>

</form>

<script>

document.write("表单pw1的类型:"+document.form1.pw1.type+"<br>")

document.write("表单pw1的名称:"+document.form1.pw1.name+"<br>")

document.write("表单pw1的值:"+document.form1.pw1.value+"<br>")

document.write("表单pw1的大小:"+document.form1.pw1.size+"<br>")

</script>

 

3.使用隐藏字段

 

<form name=form1>

<input type=hidden name=hid1 value=pieceof eight>

</form>

<script>

document.write("表单hid1的类型:"+document.form1.hid1.type+"<br>")

document.write("表单hid1的名称:"+document.form1.hid1.name+"<br>")

document.write("表单hid1的值:"+document.form1.hid1.value+"<br>")

</script>

 

4.使用文本区域框

 

<form name=form1>

<textarea name=ta1>how many grains ofsand are there in the sahara desert?</textarea>

</form>

<script>

document.write("表单ta1的类型:"+document.form1.ta1.type+"<br>")

document.write("表单ta1的名称:"+document.form1.ta1.name+"<br>")

document.write("表单ta1的值:"+document.form1.ta1.value+"<br>")

document.write("表单ta1的横向宽度:"+document.form1.ta1.cols+"<br>")

document.write("表单ta1的纵向宽度:"+document.form1.rows.value+"<br>")

</script>

 

6.使用重置按钮

 

<form name=form1>

<input type=reset name=reset1value="rest form">

</form>

<script>

document.write("表单reset1的类型:"+document.form1.reset1.type+"<br>")

document.write("表单reset1的名称:"+document.form1.reset1.name+"<br>")

document.write("表单reset1的值:"+document.form1.reset1.value+"<br>")

</script>

 

7.使用提交按钮

 

<form name=form1>

<input type=submit name=submit1 value="submitform">

</form>

<script>

document.write("表单submit1的类型:"+document.form1.submit1.type+"<br>")

document.write("表单submit1的名称:"+document.form1.submit1.name+"<br>")

document.write("表单submit1的值:"+document.form1.submit1.value+"<br>")

</script>

 

8.使用复选按钮

 

<form name=form1>

<input type=checkbox name=cb1>computer savvy?

</form>

<script>

document.write("表单cb1的类型:"+document.form1.cb1.type+"<br>")

document.write("表单cb1是否被选择?:"+document.form1.cb1.checked+"<br>")

document.write("表单cb1的名称:"+document.form1.cb1.name+"<br>")

</script>

 

9.使用单选按钮

 

<form name=form1>

<input type=radio name=radio1>male

<input type=radio name=radio1>female

</form>

<script>

document.write("第一个按钮被选择"+document.form1.radio1[0].checked+"<br>")

document.write("第二个按钮被选择"+document.form1.radio1[1].checked+"<br>")

document.write("按钮的名称"+document.form1.radio1[0].name+"<br>")

document.write("按钮的个数"+document.form1.radio1.length)

</script>

 

10.使用选择列表

 

<form name=form1>

<select name=select1 size=4>

<option name=option1value=lon>london,England</option>

<option name=option2value=dub>Dublin,Ireland</option>

</select>

</form>

<script>

document.write("这个选择列表的名称"+document.form1.select1.name+"<br>")

document.write("这个选择列表的长度"+document.form1.select1.length+"<br>")

document.write("这个选择列表当前被选择的索引号"+document.form1.select1.selectedIndex+"<br>")

document.write("这个选择列表的尺寸"+document.form1.select1.size+"<br>")

</script>

 

11.验证表单的有效性

 

<script>

function validate(){

if(document.form1.text1.value!='1'||'2'||'3'||'4'){

alert("请输入1~4的整数")

}

}

</script>

<form name=form1>

请输入1~4的整数:

<input type=text name=text1 size=4onchange=validate()>

</form>

 

12.控制表单焦点

 

<form name=form1>

<input type=text name=text1 value=whereis you focus?><br>

<input type=text name=text2 value=isthere?><br>

<input type=text name=text3 value=ormaybe here?><br>

<input type=button name=button1value="text box #1"onclick=document.form1.text1.focus()><br>

<input type=button name=button2value="text box #2"onclick=document.form1.text2.focus()><br>

<input type=button name=button3value="text box #3"onclick=document.form1.text3.focus()><br>

</form>

 

第十三章 使用分栏

 

第十四章 使用navigator

 

1.使用navigator对象

 

<script>

document.write("navigator对象的属性"+"<br>")

document.write("appcodename:"+navigator.appCodeName+"<br>")

document.write("appname::"+navigator.appName+"<br>")

document.write("appversion:"+navigator.appVersion+"<br>")

document.write("platform:"+navigator.platform+"<br>")

document.write("userAgent:"+navigator.userAgent+"<br>")

</script>

<script>

document.write("navigator对象的方法"+"<br>")

document.write("javaEnabled():"+navigator.javaEnabled())

</script>

 

2.检查用户的浏览器

 

<script>

if(navigator.appName.indexOf("Microsoft")!=-1){

document.write("用户浏览器是微软的IE浏览器"+"<br>")}

elseif(navigator.appName.indexOf("Netscape")!=-1){

document.write("用户浏览器是netscape的netscape浏览器"+"<br>")}

if(navigator.appVersion.indexOf("4.0")!=-1){

document.write("you are using aversion 4.0compatible browser")

}

else{

document.write("this browser is not4.0 compliant")}

</script>

 

3.检测用户的操作系统

 

<script>

if(navigator.platform.indexOf("win32")!=-1){

document.write("you are using acomputer running windows 95 or highter")}

else{

document.write("this computer is notrunning windows 95 or higher")}

</script>

 

4.使用location对象

 

<script>

document.write("location对象的属性"+"<br>")

document.write("hash"+location.hash+"<br>")

document.write("hostname"+location.hostname+"<br>")

document.write("host"+location.host+"<br>")

document.write("href"+location.href+"<br>")

document.write("port"+location.port+"<br>")

document.write("search"+location.search+"<br>")

</script>

 

重新加载网页

<form name=form1>

<input type=button name=button1 value=重新加载本页 onclick=location.reload>

</form>

 

5.使用cookie

 

<script>

finction makecookie(){

if(!document.cookie){

name=prompt("请输入你的姓名");

document.cookie="name="+name+";";}

}

</script>

 

<body onload=makecookie()>

<script>

function makecookie(){

if(!document.cookie){

name=prompt("请输入你的姓名")

document.cookie="name="+name+";";

namestart=document.cookie.indexOf("=");

nameend=document.cookieindexOf(";");

document.writeln("your nameis:"+document.cookie.substring(namestart+1,nameend)+",br>")

}

}

</script>

 

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