JAVASCRIPT{精彩200例转自CSDN}===第四部份(转)

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145.给类定义新的方法
function trim_1()
{
  return this.replace(/(^/s*)|(/s*$)/g, "");
}
String.prototype.trim=trim_1;
alert('cindy'.trim());

146.定义一个将日期类型转化为字符串的方法
function guoguo_date()
{
var tmp1,tmp2;
tmp1 =this.getMonth()+1+"";
if(tmp1.length<2)
  tmp1="0"+tmp1;
tmp2 =this.getDate()+"";
if(tmp2.length<2)
  tmp2="0"+tmp2;

return this.getYear()+"-"+tmp1+"-"+tmp2;
}
Date.prototype.toLiteString=guoguo_date;
alert(new Date().toLiteString())

147. pasta 是有四个参数的构造器,定义对象。
function pasta(grain, width, shape, hasEgg)
{
    // 是用什么粮食做的？

    this.grain = grain;

    // 多宽？（数值）

    this.width = width;

    // 横截面形状？（字符串）

    this.shape = shape;

    // 是否加蛋黄？（boolean）

    this.hasEgg = hasEgg;

    //定义方法

    this.toString=aa;
}
function aa()
{
;
}
//定义了对象构造器后，用 new 运算符创建对象实例。

var spaghetti = new pasta("wheat", 0.2, "circle", true);
var linguine = new pasta("wheat", 0.3, "oval", true);
//补充定义属性，spaghetti和linguine都将自动获得新的属性

pasta.prototype.foodgroup = "carbohydrates";

148.打印出错误原因
try
{
x = y // 产生错误。

}
catch(e)
{
   document.write(e.description) //打印 "'y' is undefined".

}//

149.生成EXCEL文件并保存
var ExcelSheet;
ExcelApp = new ActiveXObject("Excel.Application");
ExcelSheet = new ActiveXObject("Excel.Sheet");
//本代码启动创建对象的应用程序（在这种情况下，Microsoft Excel 工作表）。一旦对象被创建，就可以用定义的对

象变量在代码中引用它。在下面的例子中，通过对象变量 ExcelSheet 访问新对象的属性和方法和其他 Excel 对象，

包括 Application 对象和 ActiveSheet.Cells 集合。
// 使 Excel 通过 Application 对象可见。

ExcelSheet.Application.Visible = true;
// 将一些文本放置到表格的第一格中。

ExcelSheet.ActiveSheet.Cells(1,1).Value = "This is column A, row 1";
// 保存表格。

ExcelSheet.SaveAs("C://TEST.XLS");
// 用 Application 对象用 Quit 方法关闭 Excel。

ExcelSheet.Application.Quit();//

150.根据标签获得一组对象
var coll = document.all.tags("DIV");
if (coll!=null)
{
for (i=0; i<coll.length; i++)
...
}//


151.实现打印预览及打印
<OBJECT classid="CLSID:8856F961-340A-11D0-A96B-00C04FD705A2" height=0 id=wb name=wb width=0></OBJECT>
<input type=button value=打印预览 onclick="wb.execwb(7,1)">
<input type=button onClick=document.all.wb.ExecWB(6,1) value="打印">//

152.不通过form，直接通过名字引用对象
<INPUT TYPE="text" NAME="gg" value=aaaaa>
<SCRIPT LANGUAGE="JavaScript">


</SCRIPT>//

153.使鼠标滚轮失效
function document.onmousewheel()
{
return false;
}//

154.创建弹出窗口
<SCRIPT LANGUAGE="JScript">
  var oPopup = window.createPopup();
  var oPopupBody = oPopup.document.body;
  oPopupBody.innerHTML = "Display some <B>HTML</B> here.";
  oPopup.show(100, 100, 200, 50, document.body);
</SCRIPT>//

155.取得鼠标所在处的对象
var obj = document.elementFromPoint(event.x,event.y);//

156.获得左边的对象
<INPUT TYPE="text" NAME="gg"><INPUT TYPE="text" NAME="bb"

onclick="this.previousSibling.value='guoguo'">//

157.定位鼠标
document.all.hint_layer.style.left = event.x+document.body.scrollLeft+10;
document.all.hint_layer.style.top = event.y+document.body.scrollTop+10;//

158.向下拉框指定位置添加项目
var op = document.createElement("OPTION");
document.all.selected_items.children(index).insertAdjacentElement("BeforeBegin",op);
op.text = document.all.all_items[i].text;
op.value = document.all.all_items[i].value;//

159.判断一个窗口是否已经打开，如果已经打开，则关闭之
var a;
if(a)
a.close();
else
a=window.open('','','');//

160.动态创建一个标签
newElem = document.createElement("DIV");
newElem.id = "hint_layer";
document.body.appendChild(newElem);
document.all.hint_layer.innerText="guoguo";//

161.标题栏
document.title//

162.背景图片
<body style="BACKGROUND-ATTACHMENT: fixed" background="img/bgfix.gif" ></body>//背景图片不动

<STYLE TYPE="text/css">

</STYLE>//背景图片居中

163.设置透明效果
document.form.xxx.filters.alpha.opacity=0～100//

164.定义方法
var dragapproved=false;
document.onmouseup=new Function("dragapproved = false");//

165.将数字转化为人民币大写形式
function convertCurrency(currencyDigits) {
// Constants:

var MAXIMUM_NUMBER = 99999999999.99;
// Predefine the radix characters and currency symbols for output:

var CN_ZERO = "零";
var CN_ONE = "壹";
var CN_TWO = "贰";
var CN_THREE = "叁";
var CN_FOUR = "肆";
var CN_FIVE = "伍";
var CN_SIX = "陆";
var CN_SEVEN = "柒";
var CN_EIGHT = "捌";
var CN_NINE = "玖";
var CN_TEN = "拾";
var CN_HUNDRED = "佰";
var CN_THOUSAND = "仟";
var CN_TEN_THOUSAND = "万";
var CN_HUNDRED_MILLION = "亿";
var CN_SYMBOL = "人民币";
var CN_DOLLAR = "元";
var CN_TEN_CENT = "角";
var CN_CENT = "分";
var CN_INTEGER = "整";

// Variables:

var integral; // Represent integral part of digit number.

var decimal; // Represent decimal part of digit number.

var outputCharacters; // The output result.

var parts;
var digits, radices, bigRadices, decimals;
var zeroCount;
var i, p, d;
var quotient, modulus;

// Validate input string:

currencyDigits = currencyDigits.toString();
if (currencyDigits == "") {
  alert("Empty input!");
  return "";
}
if (currencyDigits.match(/[^,./d]/) != null) {
  alert("Invalid characters in the input string!");
  return "";
}
if ((currencyDigits).match(/^((/d{1,3}(,/d{3})*(.((/d{3},)*/d{1,3}))?)|(/d+(./d+)?))$/) == null) {
  alert("Illegal format of digit number!");
  return "";
}

// Normalize the format of input digits:

currencyDigits = currencyDigits.replace(/,/g, ""); // Remove comma delimiters.

currencyDigits = currencyDigits.replace(/^0+/, ""); // Trim zeros at the beginning.

// Assert the number is not greater than the maximum number.

if (Number(currencyDigits) > MAXIMUM_NUMBER) {
  alert("Too large a number to convert!");
  return "";
}

// Process the coversion from currency digits to characters:

// Separate integral and decimal parts before processing coversion:

parts = currencyDigits.split(".");
if (parts.length > 1) {
  integral = parts[0];
  decimal = parts[1];
  // Cut down redundant decimal digits that are after the second.

  decimal = decimal.substr(0, 2);
}
else {
  integral = parts[0];
  decimal = "";
}
// Prepare the characters corresponding to the digits:

digits = new Array(CN_ZERO, CN_ONE, CN_TWO, CN_THREE, CN_FOUR, CN_FIVE, CN_SIX, CN_SEVEN, CN_EIGHT,

CN_NINE);
radices = new Array("", CN_TEN, CN_HUNDRED, CN_THOUSAND);
bigRadices = new Array("", CN_TEN_THOUSAND, CN_HUNDRED_MILLION);
decimals = new Array(CN_TEN_CENT, CN_CENT);
// Start processing:

outputCharacters = "";
// Process integral part if it is larger than 0:

if (Number(integral) > 0) {
  zeroCount = 0;