原生态纯JavaScript 100大技巧大收集---你值得拥有

1、原生JavaScript实现字符串长度截取

function cutstr(str, len) {     var temp;     var icount = 0;     var patrn = /[^\x00-\xff]/;     var strre = "";     for (var i = 0; i < str.length; i++) {         if (icount < len - 1) {             temp = str.substr(i, 1);             if (patrn.exec(temp) == null) {                 icount = icount + 1             } else {                 icount = icount + 2             }             strre += temp         } else {             break         }     }     return strre + "..." } 

2、原生JavaScript获取域名主机

function getHost(url) {    var host = "null";    if(typeof url == "undefined"|| null == url) {        url = window.location.href;    }    var regex = /^\w+\:\/\/([^\/]*).*/;    var match = url.match(regex);    if(typeof match != "undefined" && null != match) {        host = match[1];    }    return host;}

3、原生JavaScript清除空格

String.prototype.trim = function() {    var reExtraSpace = /^\s*(.*?)\s+$/;    return this.replace(reExtraSpace, "$1")}

4、原生JavaScript替换全部

String.prototype.replaceAll = function(s1, s2) {    return this.replace(new RegExp(s1, "gm"), s2)}

5、原生JavaScript转义html标签

function HtmlEncode(text) {    return text.replace(/&/g, '&').replace(/\"/g, '"').replace(/</g, '<').replace(/>/g, '>')}

6、原生JavaScript还原html标签

function HtmlDecode(text) {    return text.replace(/&/g, '&').replace(/"/g, '\"').replace(/</g, '<').replace(/>/g, '>')}

7、原生JavaScript时间日期格式转换

Date.prototype.Format = function(formatStr) {    var str = formatStr;    var Week = ['日', '一', '二', '三', '四', '五', '六'];    str = str.replace(/yyyy|YYYY/, this.getFullYear());    str = str.replace(/yy|YY/, (this.getYear() % 100) > 9 ? (this.getYear() % 100).toString() : '0' + (this.getYear() % 100));    str = str.replace(/MM/, (this.getMonth() + 1) > 9 ? (this.getMonth() + 1).toString() : '0' + (this.getMonth() + 1));    str = str.replace(/M/g, (this.getMonth() + 1));    str = str.replace(/w|W/g, Week[this.getDay()]);    str = str.replace(/dd|DD/, this.getDate() > 9 ? this.getDate().toString() : '0' + this.getDate());    str = str.replace(/d|D/g, this.getDate());    str = str.replace(/hh|HH/, this.getHours() > 9 ? this.getHours().toString() : '0' + this.getHours());    str = str.replace(/h|H/g, this.getHours());    str = str.replace(/mm/, this.getMinutes() > 9 ? this.getMinutes().toString() : '0' + this.getMinutes());    str = str.replace(/m/g, this.getMinutes());    str = str.replace(/ss|SS/, this.getSeconds() > 9 ? this.getSeconds().toString() : '0' + this.getSeconds());    str = str.replace(/s|S/g, this.getSeconds());    return str}

8、原生JavaScript判断是否为数字类型

function isDigit(value) {    var patrn = /^[0-9]*$/;    if (patrn.exec(value) == null || value == "") {        return false    } else {        return true    }}

9、原生JavaScript设置cookie值

function setCookie(name, value, Hours) {    var d = new Date();    var offset = 8;    var utc = d.getTime() + (d.getTimezoneOffset() * 60000);    var nd = utc + (3600000 * offset);    var exp = new Date(nd);    exp.setTime(exp.getTime() + Hours * 60 * 60 * 1000);    document.cookie = name + "=" + escape(value) + ";path=/;expires=" + exp.toGMTString() + ";domain=360doc.com;"}

10、原生JavaScript获取cookie值

function getCookie(name) {    var arr = document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)"));    if (arr != null) return unescape(arr[2]);    return null}

11、原生JavaScript加入收藏夹

function AddFavorite(sURL, sTitle) {    try {        window.external.addFavorite(sURL, sTitle)    } catch(e) {        try {            window.sidebar.addPanel(sTitle, sURL, "")        } catch(e) {            alert("加入收藏失败，请使用Ctrl+D进行添加")        }    }}

12、原生JavaScript设为首页

function setHomepage() {    if (document.all) {        document.body.style.behavior = 'url(#default#homepage)';        document.body.setHomePage('http://www.jq-school.com')    } else if (window.sidebar) {        if (window.netscape) {            try {                netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect")            } catch(e) {                alert("该操作被浏览器拒绝，如果想启用该功能，请在地址栏内输入 about:config,然后将项 signed.applets.codebase_principal_support 值该为true")            }        }        var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components.interfaces.nsIPrefBranch);        prefs.setCharPref('browser.startup.homepage', 'http://www.jq-school.com')    }}

13、原生JavaScript判断IE6

var ua = navigator.userAgent.toLowerCase();var isIE6 = ua.indexOf("msie 6") > -1;if (isIE6) {    try {        document.execCommand("BackgroundImageCache", false, true)    } catch(e) {}}

14、原生JavaScript加载样式文件

function LoadStyle(url) {    try {        document.createStyleSheet(url)    } catch(e) {        var cssLink = document.createElement('link');        cssLink.rel = 'stylesheet';        cssLink.type = 'text/css';        cssLink.href = url;        var head = document.getElementsByTagName('head')[0];        head.appendChild(cssLink)    }}

15、原生JavaScript返回脚本内容

function evalscript(s) {if(s.indexOf('<script') == -1) return s;var p = /<script[^\>]*?>([^\x00]*?)<\/script>/ig;var arr = [];while(arr = p.exec(s)) {var p1 = /<script[^\>]*?src=\"([^\>]*?)\"[^\>]*?(reload=\"1\")?(?:charset=\"([\w\-]+?)\")?><\/script>/i;var arr1 = [];arr1 = p1.exec(arr[0]);if(arr1) {appendscript(arr1[1], '', arr1[2], arr1[3]);} else {p1 = /<script(.*?)>([^\x00]+?)<\/script>/i;arr1 = p1.exec(arr[0]);appendscript('', arr1[2], arr1[1].indexOf('reload=') != -1);}}return s;}

16、原生JavaScript清除脚本内容

function stripscript(s) {return s.replace(/<script.*?>.*?<\/script>/ig, '');}

17、原生JavaScript动态加载脚本文件

function appendscript(src, text, reload, charset) {var id = hash(src + text);if(!reload && in_array(id, evalscripts)) return;if(reload && $(id)) {$(id).parentNode.removeChild($(id));}evalscripts.push(id);var scriptNode = document.createElement("script");scriptNode.type = "text/javascript";scriptNode.id = id;scriptNode.charset = charset ? charset : (BROWSER.firefox ? document.characterSet : document.charset);try {if(src) {scriptNode.src = src;scriptNode.onloadDone = false;scriptNode.onload = function () {scriptNode.onloadDone = true;JSLOADED[src] = 1;};scriptNode.onreadystatechange = function () {if((scriptNode.readyState == 'loaded' || scriptNode.readyState == 'complete') && !scriptNode.onloadDone) {scriptNode.onloadDone = true;JSLOADED[src] = 1;}};} else if(text){scriptNode.text = text;}document.getElementsByTagName('head')[0].appendChild(scriptNode);} catch(e) {}}

18、原生JavaScript返回按ID检索的元素对象

function $(id) {return !id ? null : document.getElementById(id);}

19、原生JavaScript返回浏览器版本内容

function browserVersion(types) {var other = 1;for(i in types) {var v = types[i] ? types[i] : i;if(USERAGENT.indexOf(v) != -1) {var re = new RegExp(v + '(\\/|\\s)([\\d\\.]+)', 'ig');var matches = re.exec(USERAGENT);var ver = matches != null ? matches[2] : 0;other = ver !== 0 && v != 'mozilla' ? 0 : other;}else {var ver = 0;}eval('BROWSER.' + i + '= ver');}BROWSER.other = other;}

20、原生JavaScript元素显示的通用方法

function $(id) {return !id ? null : document.getElementById(id);}function display(id) {var obj = $(id);if(obj.style.visibility) {obj.style.visibility = obj.style.visibility == 'visible' ? 'hidden' : 'visible';} else {obj.style.display = obj.style.display == '' ? 'none' : '';}}

21、原生JavaScript中有insertBefore方法,可惜却没有insertAfter方法?用如下函数实现

function insertAfter(newChild,refChild){ var parElem=refChild.parentNode; if(parElem.lastChild==refChild){ refChild.appendChild(newChild); }else{ parElem.insertBefore(newChild,refChild.nextSibling); } }

22、原生JavaScript中兼容浏览器绑定元素事件

function addEventSamp(obj,evt,fn){ if (obj.addEventListener) { obj.addEventListener(evt, fn, false); }else if(obj.attachEvent){ obj.attachEvent('on'+evt,fn); } } 

23、原生JavaScript光标停在文字的后面，文本框获得焦点时调用

function focusLast(){ var e = event.srcElement; var r =e.createTextRange(); r.moveStart('character',e.value.length); r.collapse(true); r.select(); }

24、原生JavaScript检验URL链接是否有效

function getUrlState(URL){ var xmlhttp = new ActiveXObject("microsoft.xmlhttp"); xmlhttp.Open("GET",URL, false);  try{  xmlhttp.Send(); }catch(e){}finally{ var result = xmlhttp.responseText; if(result){ if(xmlhttp.Status==200){ return(true); }else{ return(false); } }else{ return(false); } } }

25、原生JavaScript格式化CSS样式代码

function formatCss(s){//格式化代码s = s.replace(/\s*([\{\}\:\;\,])\s*/g, "$1");s = s.replace(/;\s*;/g, ";"); //清除连续分号s = s.replace(/\,[\s\.\#\d]*{/g, "{");s = s.replace(/([^\s])\{([^\s])/g, "$1 {\n\t$2");s = s.replace(/([^\s])\}([^\n]*)/g, "$1\n}\n$2");s = s.replace(/([^\s]);([^\s\}])/g, "$1;\n\t$2");return s;}

26、原生JavaScript压缩CSS样式代码

function yasuoCss (s) {//压缩代码s = s.replace(/\/\*(.|\n)*?\*\//g, ""); //删除注释s = s.replace(/\s*([\{\}\:\;\,])\s*/g, "$1");s = s.replace(/\,[\s\.\#\d]*\{/g, "{"); //容错处理s = s.replace(/;\s*;/g, ";"); //清除连续分号s = s.match(/^\s*(\S+(\s+\S+)*)\s*$/); //去掉首尾空白return (s == null) ? "" : s[1];}

27、原生JavaScript获取当前路径

var currentPageUrl = "";if (typeof this.href === "undefined") {    currentPageUrl = document.location.toString().toLowerCase();}else {    currentPageUrl = this.href.toString().toLowerCase();}

28、原生JavaScriptIP转成整型

function _ip2int(ip){    var num = 0;    ip = ip.split(".");    num = Number(ip[0]) * 256 * 256 * 256 + Number(ip[1]) * 256 * 256 + Number(ip[2]) * 256 + Number(ip[3]);    num = num >>> 0;    return num;}

29、原生JavaScript整型解析为IP地址

function _int2iP(num){    var str;    var tt = new Array();    tt[0] = (num >>> 24) >>> 0;    tt[1] = ((num << 8) >>> 24) >>> 0;    tt[2] = (num << 16) >>> 24;    tt[3] = (num << 24) >>> 24;    str = String(tt[0]) + "." + String(tt[1]) + "." + String(tt[2]) + "." + String(tt[3]);    return str;}

30、原生JavaScript实现checkbox全选与全不选

function checkAll() {var selectall = document.getElementById("selectall");var allbox = document.getElementsByName("allbox");if (selectall.checked) {for (var i = 0; i < allbox.length; i++) {allbox[i].checked = true;}} else {for (var i = 0; i < allbox.length; i++) {allbox[i].checked = false;}}}

(31~40)移动篇
31、原生JavaScript判断是否移动设备

function isMobile(){if (typeof this._isMobile === 'boolean'){return this._isMobile;}var screenWidth = this.getScreenWidth();var fixViewPortsExperiment = rendererModel.runningExperiments.FixViewport || rendererModel.runningExperiments.fixviewport;var fixViewPortsExperimentRunning = fixViewPortsExperiment && (fixViewPortsExperiment.toLowerCase() === "new");if(!fixViewPortsExperiment){if(!this.isAppleMobileDevice()){screenWidth = screenWidth/window.devicePixelRatio;}}var isMobileScreenSize = screenWidth < 600;var isMobileUserAgent = false;this._isMobile = isMobileScreenSize && this.isTouchScreen();return this._isMobile;}

32、原生JavaScript判断是否移动设备访问

function isMobileUserAgent(){return (/iphone|ipod|android.*mobile|windows.*phone|blackberry.*mobile/i.test(window.navigator.userAgent.toLowerCase()));}

33、原生JavaScript判断是否苹果移动设备访问

function isAppleMobileDevice(){return (/iphone|ipod|ipad|Macintosh/i.test(navigator.userAgent.toLowerCase()));}

34、原生JavaScript判断是否安卓移动设备访问

function isAndroidMobileDevice(){return (/android/i.test(navigator.userAgent.toLowerCase()));}

35、原生JavaScript判断是否Touch屏幕

function isTouchScreen(){return (('ontouchstart' in window) || window.DocumentTouch && document instanceof DocumentTouch);}

36、原生JavaScript判断是否在安卓上的谷歌浏览器

function isNewChromeOnAndroid(){if(this.isAndroidMobileDevice()){var userAgent = navigator.userAgent.toLowerCase();if((/chrome/i.test(userAgent))){var parts = userAgent.split('chrome/');var fullVersionString = parts[1].split(" ")[0];var versionString = fullVersionString.split('.')[0];var version = parseInt(versionString);if(version >= 27){return true;}}}return false;}

37、原生JavaScript判断是否打开视窗

function isViewportOpen() {return !!document.getElementById('wixMobileViewport');}

38、原生JavaScript获取移动设备初始化大小

function getInitZoom(){if(!this._initZoom){var screenWidth = Math.min(screen.height, screen.width);if(this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()){screenWidth = screenWidth/window.devicePixelRatio;}this._initZoom = screenWidth /document.body.offsetWidth;}return this._initZoom;}

39、原生JavaScript获取移动设备最大化大小

function getZoom(){var screenWidth = (Math.abs(window.orientation) === 90) ? Math.max(screen.height, screen.width) : Math.min(screen.height, screen.width);if(this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()){screenWidth = screenWidth/window.devicePixelRatio;}var FixViewPortsExperiment = rendererModel.runningExperiments.FixViewport || rendererModel.runningExperiments.fixviewport;var FixViewPortsExperimentRunning = FixViewPortsExperiment && (FixViewPortsExperiment === "New" || FixViewPortsExperiment === "new");if(FixViewPortsExperimentRunning){return screenWidth / window.innerWidth;}else{return screenWidth / document.body.offsetWidth;}}

40、原生JavaScript获取移动设备屏幕宽度

function getScreenWidth(){var smallerSide = Math.min(screen.width, screen.height);var fixViewPortsExperiment = rendererModel.runningExperiments.FixViewport || rendererModel.runningExperiments.fixviewport;var fixViewPortsExperimentRunning = fixViewPortsExperiment && (fixViewPortsExperiment.toLowerCase() === "new");if(fixViewPortsExperiment){if(this.isAndroidMobileDevice() && !this.isNewChromeOnAndroid()){smallerSide = smallerSide/window.devicePixelRatio;}}return smallerSide;}

41、原生JavaScript完美判断是否为网址

function IsURL(strUrl) {    var regular = /^\b(((https?|ftp):\/\/)?[-a-z0-9]+(\.[-a-z0-9]+)*\.(?:com|edu|gov|int|mil|net|org|biz|info|name|museum|asia|coop|aero|[a-z][a-z]|((25[0-5])|(2[0-4]\d)|(1\d\d)|([1-9]\d)|\d))\b(\/[-a-z0-9_:\@&?=+,.!\/~%\$]*)?)$/i    if (regular.test(strUrl)) {        return true;    }    else {        return false;    }}

42、原生JavaScript根据样式名称检索元素对象

function getElementsByClassName(name) {    var tags = document.getElementsByTagName('*') || document.all;    var els = [];    for (var i = 0; i < tags.length; i++) {        if (tags[i].className) {            var cs = tags[i].className.split(' ');            for (var j = 0; j < cs.length; j++) {                if (name == cs[j]) {                    els.push(tags[i]);                    break                }            }        }    }    return els}

43、原生JavaScript判断是否以某个字符串开头

String.prototype.startWith = function (s) {    return this.indexOf(s) == 0}

44、原生JavaScript判断是否以某个字符串结束

String.prototype.endWith = function (s) {    var d = this.length - s.length;    return (d >= 0 && this.lastIndexOf(s) == d)}

45、原生JavaScript返回IE浏览器的版本号

function getIE(){    if (window.ActiveXObject){        var v = navigator.userAgent.match(/MSIE ([^;]+)/)[1];        return parseFloat(v.substring(0, v.indexOf(".")))    }    return false}

46、原生JavaScript获取页面高度

function getPageHeight(){var g = document, a = g.body, f = g.documentElement, d = g.compatMode == "BackCompat"? a: g.documentElement;return Math.max(f.scrollHeight, a.scrollHeight, d.clientHeight);}

47、原生JavaScript获取页面scrollLeft

function getPageScrollLeft(){var a = document;return a.documentElement.scrollLeft || a.body.scrollLeft;}

48、原生JavaScript获取页面可视宽度

function getPageViewWidth(){var d = document, a = d.compatMode == "BackCompat"? d.body: d.documentElement;return a.clientWidth;}

49、原生JavaScript获取页面宽度

function getPageWidth(){var g = document, a = g.body, f = g.documentElement, d = g.compatMode == "BackCompat"? a: g.documentElement;return Math.max(f.scrollWidth, a.scrollWidth, d.clientWidth);}

50、原生JavaScript获取页面scrollTop

function getPageScrollTop(){var a = document;return a.documentElement.scrollTop || a.body.scrollTop;}

51、原生JavaScript获取页面可视高度

function getPageViewHeight() {var d = document, a = d.compatMode == "BackCompat"? d.body: d.documentElement;return a.clientHeight;}
52、原生JavaScript跨浏览器添加事件

function addEvt(oTarget,sEvtType,fnHandle){if(!oTarget){return;}if(oTarget.addEventListener){oTarget.addEventListener(sEvtType,fnHandle,false);}else if(oTarget.attachEvent){oTarget.attachEvent("on" + sEvtType,fnHandle);}else{oTarget["on" + sEvtType] = fnHandle;}}
53、原生JavaScript跨浏览器删除事件

function delEvt(oTarget,sEvtType,fnHandle){if(!oTarget){return;}if(oTarget.addEventListener){oTarget.addEventListener(sEvtType,fnHandle,false);}else if(oTarget.attachEvent){oTarget.attachEvent("on" + sEvtType,fnHandle);}else{oTarget["on" + sEvtType] = fnHandle;}}
54、原生JavaScript去掉url前缀

function removeUrlPrefix(a){  a=a.replace(/：/g,":").replace(/．/g,".").replace(/／/g,"/");  while(trim(a).toLowerCase().indexOf("http://")==0){    a=trim(a.replace(/http:\/\//i,""));  }  return a;}
55、原生JavaScript随机数时间戳

function uniqueId(){var a=Math.random,b=parseInt;return Number(new Date()).toString()+b(10*a())+b(10*a())+b(10*a());}

56、原生JavaScript全角半角转换,iCase: 0全到半，1半到全，其他不转化

function chgCase(sStr,iCase){if(typeof sStr != "string" || sStr.length <= 0 || !(iCase === 0 || iCase == 1)){return sStr;}var i,oRs=[],iCode;if(iCase){/*半->全*/for(i=0; i<sStr.length;i+=1){ iCode = sStr.charCodeAt(i);if(iCode == 32){iCode = 12288;}else if(iCode < 127){iCode += 65248;}oRs.push(String.fromCharCode(iCode)); }}else{/*全->半*/for(i=0; i<sStr.length;i+=1){ iCode = sStr.charCodeAt(i);if(iCode == 12288){iCode = 32;}else if(iCode > 65280 && iCode < 65375){iCode -= 65248;}oRs.push(String.fromCharCode(iCode)); }}return oRs.join("");}
57、原生JavaScript确认是否键盘有效输入值

function checkKey(iKey){if(iKey == 32 || iKey == 229){return true;}/*空格和异常*/if(iKey>47 && iKey < 58){return true;}/*数字*/if(iKey>64 && iKey < 91){return true;}/*字母*/if(iKey>95 && iKey < 108){return true;}/*数字键盘1*/if(iKey>108 && iKey < 112){return true;}/*数字键盘2*/if(iKey>185 && iKey < 193){return true;}/*符号1*/if(iKey>218 && iKey < 223){return true;}/*符号2*/return false;}

58、原生JavaScript获取网页被卷去的位置

function getScrollXY() {    return document.body.scrollTop ? {        x: document.body.scrollLeft,        y: document.body.scrollTop    }: {        x: document.documentElement.scrollLeft,        y: document.documentElement.scrollTop    }}
59、原生JavaScript另一种正则日期格式化函数+调用方法

Date.prototype.format = function(format){ //author: meizz  var o = {    "M+" : this.getMonth()+1, //month    "d+" : this.getDate(),    //day    "h+" : this.getHours(),   //hour    "m+" : this.getMinutes(), //minute    "s+" : this.getSeconds(), //second    "q+" : Math.floor((this.getMonth()+3)/3),  //quarter    "S" : this.getMilliseconds() //millisecond  }  if(/(y+)/.test(format)) format=format.replace(RegExp.$1,    (this.getFullYear()+"").substr(4 - RegExp.$1.length));  for(var k in o)if(new RegExp("("+ k +")").test(format))    format = format.replace(RegExp.$1,      RegExp.$1.length==1 ? o[k] :        ("00"+ o[k]).substr((""+ o[k]).length));  return format;}alert(new Date().format("yyyy-MM-dd hh:mm:ss"));
60、原生JavaScript时间个性化输出功能

/*1、< 60s, 显示为“刚刚”2、>= 1min && < 60 min, 显示与当前时间差“XX分钟前”3、>= 60min && < 1day, 显示与当前时间差“今天 XX:XX”4、>= 1day && < 1year, 显示日期“XX月XX日 XX:XX”5、>= 1year, 显示具体日期“XXXX年XX月XX日 XX:XX” */function timeFormat(time){  var date = new Date(time)    , curDate = new Date()    , year = date.getFullYear()    , month = date.getMonth() + 1    , day = date.getDate()    , hour = date.getHours()    , minute = date.getMinutes()    , curYear = curDate.getFullYear()    , curHour = curDate.getHours()    , timeStr;  if(year < curYear){    timeStr = year +'年'+ month +'月'+ day +'日 '+ hour +':'+ minute;  }else{    var pastTime = curDate - date      , pastH = pastTime/3600000;    if(pastH > curHour){      timeStr = month +'月'+ day +'日 '+ hour +':'+ minute;    }else if(pastH >= 1){      timeStr = '今天 ' + hour +':'+ minute +'分';    }else{      var pastM = curDate.getMinutes() - minute;      if(pastM > 1){        timeStr = pastM +'分钟前';      }else{        timeStr = '刚刚';      }    }  }  return timeStr;}

61、原生JavaScript解决offsetX兼容性问题

// 针对火狐不支持offsetX/Yfunction getOffset(e){  var target = e.target, // 当前触发的目标对象      eventCoord,      pageCoord,      offsetCoord;  // 计算当前触发元素到文档的距离  pageCoord = getPageCoord(target);  // 计算光标到文档的距离  eventCoord = {    X : window.pageXOffset + e.clientX,    Y : window.pageYOffset + e.clientY  };  // 相减获取光标到第一个定位的父元素的坐标  offsetCoord = {    X : eventCoord.X - pageCoord.X,    Y : eventCoord.Y - pageCoord.Y  };  return offsetCoord;}function getPageCoord(element){  var coord = { X : 0, Y : 0 };  // 计算从当前触发元素到根节点为止，  // 各级 offsetParent 元素的 offsetLeft 或 offsetTop 值之和  while (element){    coord.X += element.offsetLeft;    coord.Y += element.offsetTop;    element = element.offsetParent;  }  return coord;}

62、原生JavaScript常用的正则表达式

//正整数/^[0-9]*[1-9][0-9]*$/;//负整数/^-[0-9]*[1-9][0-9]*$/;//正浮点数/^(([0-9]+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*))$/;   //负浮点数/^(-(([0-9]+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*)))$/;  //浮点数/^(-?\d+)(\.\d+)?$/;//email地址/^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$/;//url地址/^[a-zA-z]+://(\w+(-\w+)*)(\.(\w+(-\w+)*))*(\?\S*)?$/;//年/月/日（年-月-日、年.月.日）/^(19|20)\d\d[- /.](0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])$/;//匹配中文字符/[\u4e00-\u9fa5]/;//匹配帐号是否合法(字母开头，允许5-10字节，允许字母数字下划线)/^[a-zA-Z][a-zA-Z0-9_]{4,9}$/;//匹配空白行的正则表达式/\n\s*\r/;//匹配中国邮政编码/[1-9]\d{5}(?!\d)/;//匹配身份证/\d{15}|\d{18}/;//匹配国内电话号码/(\d{3}-|\d{4}-)?(\d{8}|\d{7})?/;//匹配IP地址/((2[0-4]\d|25[0-5]|[01]?\d\d?)\.){3}(2[0-4]\d|25[0-5]|[01]?\d\d?)/;//匹配首尾空白字符的正则表达式/^\s*|\s*$/;//匹配HTML标记的正则表达式< (\S*?)[^>]*>.*?|< .*? />;

63、原生JavaScript实现返回顶部的通用方法

function backTop(btnId) {var btn = document.getElementById(btnId);var d = document.documentElement;var b = document.body;window.onscroll = set;btn.style.display = "none";btn.onclick = function() {btn.style.display = "none";window.onscroll = null;this.timer = setInterval(function() {d.scrollTop -= Math.ceil((d.scrollTop + b.scrollTop) * 0.1);b.scrollTop -= Math.ceil((d.scrollTop + b.scrollTop) * 0.1);if ((d.scrollTop + b.scrollTop) == 0) clearInterval(btn.timer, window.onscroll = set);},10);};function set() {btn.style.display = (d.scrollTop + b.scrollTop > 100) ? 'block': "none"}};backTop('goTop');

64、原生JavaScript获得URL中GET参数值

// 用法：如果地址是 test.htm?t1=1&t2=2&t3=3, 那么能取得：GET["t1"], GET["t2"], GET["t3"]function get_get(){   querystr = window.location.href.split("?")  if(querystr[1]){    GETs = querystr[1].split("&")    GET =new Array()    for(i=0;i<GETs.length;i++){      tmp_arr = GETs[i].split("=")      key=tmp_arr[0]      GET[key] = tmp_arr[1]    }  }  return querystr[1];}

65、原生JavaScript实现全选通用方法

function checkall(form, prefix, checkall) {var checkall = checkall ? checkall : 'chkall';for(var i = 0; i < form.elements.length; i++) {var e = form.elements[i];if(e.type=="checkbox"){e.checked = form.elements[checkall].checked;}}}

66、原生JavaScript实现全部取消选择通用方法

function uncheckAll(form) {for (var i=0;i<form.elements.length;i++){var e = form.elements[i];if (e.name != 'chkall')e.checked=!e.checked;}}

67、原生JavaScript实现打开一个窗体通用方法

function openWindow(url,windowName,width,height){    var x = parseInt(screen.width / 2.0) - (width / 2.0);     var y = parseInt(screen.height / 2.0) - (height / 2.0);    var isMSIE= (navigator.appName == "Microsoft Internet Explorer");    if (isMSIE) {    var p = "resizable=1,location=no,scrollbars=no,width=";    p = p+width;    p = p+",height=";    p = p+height;    p = p+",left=";    p = p+x;    p = p+",top=";    p = p+y;        retval = window.open(url, windowName, p);    } else {        var win = window.open(url, "ZyiisPopup", "top=" + y + ",left=" + x + ",scrollbars=" + scrollbars + ",dialog=yes,modal=yes,width=" + width + ",height=" + height + ",resizable=no" );        eval("try { win.resizeTo(width, height); } catch(e) { }");        win.focus();    }}

68、原生JavaScript判断是否为客户端设备

function client(o){       var b = navigator.userAgent.toLowerCase();      var t = false;   if (o == 'isOP'){ t = b.indexOf('opera') > -1;   }   if (o == 'isIE'){ t = b.indexOf('msie') > -1;   }   if (o == 'isFF'){ t = b.indexOf('firefox') > -1;   }       return t;}

69、原生JavaScript获取单选按钮的值

function get_radio_value(field){if(field&&field.length){for(var i=0;i<field.length;i++){if(field[i].checked){return field[i].value;}}}else {return ;}}

70、原生JavaScript获取复选框的值

function get_checkbox_value(field){if(field&&field.length){for(var i=0;i<field.length;i++){if(field[i].checked && !field[i].disabled){return field[i].value;}}}else {return;}}

(71~80)验证篇这一篇文章主要是10个比较常用表单验证功能，包括了邮箱、危险字符、验证长度、验证网址、验证小数、整数、浮点数等常用的验证，有了这些代码片段，平时的表单验证也可以不需要jquery的验证插件了，希望可以帮到大家。。。
 71、原生JavaScript判断是否为邮箱

function isEmail(str){    var re=/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/; if (re.test(str) != true) {return false;}else{return true;}}

72、原生JavaScript判断是否有列表中的危险字符

function isValidReg(chars){var re=/<|>|\[|\]|\{|\}|『|』|※|○|●|◎|§|△|▲|☆|★|◇|◆|□|▼|㊣|﹋|⊕|⊙|〒|ㄅ|ㄆ|ㄇ|ㄈ|ㄉ|ㄊ|ㄋ|ㄌ|ㄍ|ㄎ|ㄏ|ㄐ|ㄑ|ㄒ|ㄓ|ㄔ|ㄕ|ㄖ|ㄗ|ㄘ|ㄙ|ㄚ|ㄛ|ㄜ|ㄝ|ㄞ|ㄟ|ㄢ|ㄣ|ㄤ|ㄥ|ㄦ|ㄧ|ㄨ|ㄩ|■|▄|▆|\*|@|#|\^|\\/;if (re.test( chars) == true) {return false;}else{return true;}}

73、原生JavaScript判断字符串是否大于规定的长度

function isValidLength(chars, len) {if (chars.length < len) {return false;}return true;}

74、原生JavaScript判断字符串是为网址不区分大小写

function isValidURL( chars ) {var re=/^([hH][tT]{2}[pP]:\/\/|[hH][tT]{2}[pP][sS]:\/\/)(\S+\.\S+)$/;if (!isNULL(chars)) {chars = jsTrim(chars);if (chars.match(re) == null)return false;elsereturn true;}return false;}

75、原生JavaScript判断字符串是否为小数

function isValidDecimal( chars ) {var re=/^\d*\.?\d{1,2}$/;if (chars.match(re) == null)return false;elsereturn true;}

76、原生JavaScript判断字符串是否为整数

function isNumber( chars ) {var re=/^\d*$/;if (chars.match(re) == null)return false;elsereturn true;}

77、原生JavaScript判断字符串是否为浮点数

function isFloat( str ) {for(i=0;i<str.length;i++)  {   if ((str.charAt(i)<"0" || str.charAt(i)>"9")&& str.charAt(i) != '.'){return false;   }}return true;}

78、原生JavaScript判断字符是否为A-Za-z英文字母

function isLetters( str ){var re=/^[A-Za-z]+$/;if (str.match(re) == null)return false;elsereturn true;}

79、原生JavaScript判断字符串是否邮政编码

function isValidPost( chars ) {var re=/^\d{6}$/;if (chars.match(re) == null)return false;elsereturn true;}

80、原生JavaScript判断字符是否空NULL

function isNULL( chars ) {if (chars == null)return true;if (jsTrim(chars).length==0)return true;return false;}

81、原生JavaScript用正则表达式提取页面代码中所有网址

var aa = document.documentElement.outerHTML.match(/(url\(|src=|href=)[\"\']*([^\"\'\(\)\<\>\[\] ]+)[\"\'\)]*|(http:\/\/[\w\-\.]+[^\"\'\(\)\<\>\[\] ]+)/ig).join("\r\n").replace(/^(src=|href=|url\()[\"\']*|[\"\'\>\) ]*$/igm,"");alert(aa)

82、原生JavaScript用正则表达式清除相同的数组(低效率)

Array.prototype.unique=function(){return this.reverse().join(",").match(/([^,]+)(?!.*\1)/ig).reverse();}

83、原生JavaScript用正则表达式清除相同的数组(高效率)

String.prototype.unique=function(){var x=this.split(/[\r\n]+/);var y='';for(var i=0;i<x.length;i++){if(!new RegExp("^"+x[i].replace(/([^\w])/ig,"\\$1")+"$","igm").test(y)){y+=x[i]+"\r\n"}}return y}

84、原生JavaScript用正则表达式按字母排序，对每行进行数组排序

function SetSort(){var text=K1.value.split(/[\r\n]/).sort().join("\r\n");//顺序var test=K1.value.split(/[\r\n]/).sort().reverse().join("\r\n");//反序K1.value=K1.value!=text?text:test;}

85、原生JavaScript字符串反序

function IsReverse(text){return text.split('').reverse().join('');}

86、原生JavaScript用正则表达式清除html代码中的脚本

function clear_script(){  K1.value=K1.value.replace(/<script.*?>[\s\S]*?<\/script>|\s+on[a-zA-Z]{3,16}\s?=\s?"[\s\S]*?"|\s+on[a-zA-Z]{3,16}\s?=\s?'[\s\S]*?'|\s+on[a-zA-Z]{3,16}\s?=[^ >]+/ig,"");}

87、原生JavaScript动态执行JavaScript脚本

function javascript(){try{  eval(K1.value);}catch(e){alert(e.message);}}

88、原生JavaScript动态执行VBScript脚本

function vbscript(){try{var script=document.getElementById("K1").value;if(script.trim()=="")return;window.execScript('On Error Resume Next \n'+script+'\n If Err.Number<>0 Then \n MsgBox "请输入正确的VBScript脚本!",48,"脚本错误!" \n End If',"vbscript")}catch(e){alert(e.message);}}

89、原生JavaScript实现金额大写转换函数

function transform(tranvalue) {  try {    var i = 1;    var dw2 = new Array("", "万", "亿"); //大单位    var dw1 = new Array("拾", "佰", "仟"); //小单位    var dw = new Array("零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖"); //整数部分用    //以下是小写转换成大写显示在合计大写的文本框中         //分离整数与小数    var source = splits(tranvalue);    var num = source[0];    var dig = source[1];    //转换整数部分    var k1 = 0; //计小单位    var k2 = 0; //计大单位    var sum = 0;    var str = "";    var len = source[0].length; //整数的长度    for (i = 1; i <= len; i++) {      var n = source[0].charAt(len - i); //取得某个位数上的数字      var bn = 0;      if (len - i - 1 >= 0) {        bn = source[0].charAt(len - i - 1); //取得某个位数前一位上的数字      }      sum = sum + Number(n);      if (sum != 0) {        str = dw[Number(n)].concat(str); //取得该数字对应的大写数字，并插入到str字符串的前面        if (n == '0') sum = 0;      }      if (len - i - 1 >= 0) { //在数字范围内        if (k1 != 3) { //加小单位          if (bn != 0) {            str = dw1[k1].concat(str);          }          k1++;        } else { //不加小单位，加大单位          k1 = 0;          var temp = str.charAt(0);          if (temp == "万" || temp == "亿") //若大单位前没有数字则舍去大单位          str = str.substr(1, str.length - 1);          str = dw2[k2].concat(str);          sum = 0;        }      }      if (k1 == 3) //小单位到千则大单位进一      {        k2++;      }    }    //转换小数部分    var strdig = "";    if (dig != "") {      var n = dig.charAt(0);      if (n != 0) {        strdig += dw[Number(n)] + "角"; //加数字      }      var n = dig.charAt(1);      if (n != 0) {        strdig += dw[Number(n)] + "分"; //加数字      }    }    str += "元" + strdig;  } catch(e) {    return "0元";  }  return str;}//拆分整数与小数function splits(tranvalue) {  var value = new Array('', '');  temp = tranvalue.split(".");  for (var i = 0; i < temp.length; i++) {    value[i] = temp[i];  }  return value;}

90、原生JavaScript常用的正则表达式大收集

匹配中文字符的正则表达式： [\u4e00-\u9fa5] 匹配双字节字符（包括汉字在内）：[^\x00-\xff] 匹配空行的正则表达式：\n[\s| ]*\r 匹配 HTML 标记的正则表达式：<(.*)>.*<\/\1>|<(.*) \/>匹配首尾空格的正则表达式：(^\s*)|(\s*$) 匹配 IP 地址的正则表达式：/(\d+)\.(\d+)\.(\d+)\.(\d+)/g匹配 Email 地址的正则表达式：\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*匹配网址 URL 的正则表达式：http://(/[\w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?sql 语句：^(select|drop|delete|create|update|insert).*$ 非负整数：^\d+$ 正整数：^[0-9]*[1-9][0-9]*$ 非正整数：^((-\d+)|(0+))$ 负整数：^-[0-9]*[1-9][0-9]*$ 整数：^-?\d+$ 非负浮点数：^\d+(\.\d+)?$ 正浮点数：^((0-9)+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*))$ 非正浮点数：^((-\d+\.\d+)?)|(0+(\.0+)?))$ 英文字符串：^[A-Za-z]+$ 英文大写串：^[A-Z]+$ 英文小写串：^[a-z]+$ 英文字符数字串：^[A-Za-z0-9]+$ 英数字加下划线串：^\w+$ E-mail地址：^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$ URL：^[a-zA-Z]+://(\w+(-\w+)*)(\.(\w+(-\w+)*))*(\?\s*)?$ 或：^http:\/\/[A-Za-z0-9]+\.[A-Za-z0-9]+[\/=\?%\-&_~`@[\]\':+!]*([^<>\"\"])*$ 邮政编码：^[1-9]\d{5}$ 电话号码：^((\(\d{2,3}\))|(\d{3}\-))?(\(0\d{2,3}\)|0\d{2,3}-)?[1-9]\d{6,7}(\-\d{1,4})?$ 手机号码：^((\(\d{2,3}\))|(\d{3}\-))?13\d{9}$ 双字节字符（包括汉字在内）：^\x00-\xff 匹配首尾空格：(^\s*)|(\s*$)匹配 HTML 标记：<(.*)>.*<\/\1>|<(.*) \/> 匹配空行：\n[\s| ]*\r 提取信息中的网络链接：(h|H)(r|R)(e|E)(f|F) *= *('|")?(\w|\\|\/|\.)+('|"| *|>)? 提取信息中的邮件地址：\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)* 提取信息中的图片链接：(s|S)(r|R)(c|C) *= *('|")?(\w|\\|\/|\.)+('|"| *|>)? 提取信息中的 IP 地址：(\d+)\.(\d+)\.(\d+)\.(\d+) 提取信息中的中国手机号码：(86)*0*13\d{9} 提取信息中的中国固定电话号码：(\(\d{3,4}\)|\d{3,4}-|\s)?\d{8} 提取信息中的中国电话号码（包括移动和固定电话）：(\(\d{3,4}\)|\d{3,4}-|\s)?\d{7,14} 提取信息中的中国邮政编码：[1-9]{1}(\d+){5} 提取信息中的浮点数（即小数）：(-?\d*)\.?\d+ 提取信息中的任何数字 ：(-?\d*)(\.\d+)? IP：(\d+)\.(\d+)\.(\d+)\.(\d+) 电话区号：^0\d{2,3}$腾讯 QQ 号：^[1-9]*[1-9][0-9]*$ 帐号（字母开头，允许 5-16 字节，允许字母数字下划线）：^[a-zA-Z][a-zA-Z0-9_]{4,15}$ 中文、英文、数字及下划线：^[\u4e00-\u9fa5_a-zA-Z0-9]+$

91、原生JavaScript实现窗体改变事件resize的操作（兼容所以的浏览器）

(function(){var fn = function(){var w = document.documentElement ? document.documentElement.clientWidth : document.body.clientWidth,r = 1255,b = Element.extend(document.body),classname = b.className;if(w < r){//当窗体的宽度小于1255的时候执行相应的操作}else{//当窗体的宽度大于1255的时候执行相应的操作}}if(window.addEventListener){window.addEventListener('resize', function(){ fn(); });}else if(window.attachEvent){window.attachEvent('onresize', function(){ fn(); });}fn();})();

92、原生JavaScript用正则清除空格分左右

function ltrim(s){ return s.replace( /^(\s*|　*)/, ""); } function rtrim(s){ return s.replace( /(\s*|　*)$/, ""); } function trim(s){ return ltrim(rtrim(s));} 

93、原生JavaScript判断变量是否空值

/** * 判断变量是否空值 * undefined, null, '', false, 0, [], {} 均返回true，否则返回false */function empty(v){    switch (typeof v){        case 'undefined' : return true;        case 'string'    : if(trim(v).length == 0) return true; break;        case 'boolean'   : if(!v) return true; break;        case 'number'    : if(0 === v) return true; break;        case 'object'    :             if(null === v) return true;            if(undefined !== v.length && v.length==0) return true;            for(var k in v){return false;} return true;            break;    }    return false;}

94、原生JavaScript实现base64解码

function base64_decode(data){var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";var o1, o2, o3, h1, h2, h3, h4, bits, i = 0,ac = 0,dec = "",tmp_arr = [];if (!data) { return data; }data += '';do { h1 = b64.indexOf(data.charAt(i++));h2 = b64.indexOf(data.charAt(i++));h3 = b64.indexOf(data.charAt(i++));h4 = b64.indexOf(data.charAt(i++));bits = h1 << 18 | h2 << 12 | h3 << 6 | h4;o1 = bits >> 16 & 0xff;o2 = bits >> 8 & 0xff;o3 = bits & 0xff;if (h3 == 64) {tmp_arr[ac++] = String.fromCharCode(o1);} else if (h4 == 64) {tmp_arr[ac++] = String.fromCharCode(o1, o2);} else {tmp_arr[ac++] = String.fromCharCode(o1, o2, o3);}} while (i < data.length);dec = tmp_arr.join('');dec = utf8_decode(dec);return dec;}

95、原生JavaScript实现utf8解码

function utf8_decode(str_data){var tmp_arr = [],i = 0,ac = 0,c1 = 0,c2 = 0,c3 = 0;str_data += '';while (i < str_data.length) {c1 = str_data.charCodeAt(i);if (c1 < 128) {tmp_arr[ac++] = String.fromCharCode(c1);i++;} else if (c1 > 191 && c1 < 224) {       c2 = str_data.charCodeAt(i + 1);tmp_arr[ac++] = String.fromCharCode(((c1 & 31) << 6) | (c2 & 63));i += 2;} else {c2 = str_data.charCodeAt(i + 1);c3 = str_data.charCodeAt(i + 2);tmp_arr[ac++] = String.fromCharCode(((c1 & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));i += 3;}} return tmp_arr.join('');}

96、原生JavaScript获取窗体可见范围的宽与高

function getViewSize(){var de=document.documentElement;var db=document.body;var viewW=de.clientWidth==0 ?  db.clientWidth : de.clientWidth;var viewH=de.clientHeight==0 ?  db.clientHeight : de.clientHeight;return Array(viewW ,viewH);}

97、原生JavaScript判断IE版本号（既简洁、又向后兼容！）

var _IE = (function(){    var v = 3, div = document.createElement('div'), all = div.getElementsByTagName('i');    while (        div.innerHTML = '<!--[if gt IE ' + (++v) + ']><i></i><![endif]-->',        all[0]    );    return v > 4 ? v : false ;}());

98、原生JavaScript获取浏览器版本号

function browserVersion(types) {    var other = 1;    for (i in types) {        var v = types[i] ? types[i] : i;        if (USERAGENT.indexOf(v) != -1) {            var re = new RegExp(v + '(\\/|\\s|:)([\\d\\.]+)', 'ig');            var matches = re.exec(USERAGENT);            var ver = matches != null ? matches[2] : 0;            other = ver !== 0 && v != 'mozilla' ? 0 : other;        } else {            var ver = 0;        }        eval('BROWSER.' + i + '= ver');    }    BROWSER.other = other;}

99、原生JavaScript半角转换为全角函数

function ToDBC(str){  var result = '';  for(var i=0; i < str.length; i++){    code = str.charCodeAt(i);    if(code >= 33 && code <= 126){      result += String.fromCharCode(str.charCodeAt(i) + 65248);    }else if (code == 32){      result += String.fromCharCode(str.charCodeAt(i) + 12288 - 32);    }else{      result += str.charAt(i);    }  } return result;}

100、原生JavaScript全角转换为半角函数 

function ToCDB(str){  var result = '';  for(var i=0; i < str.length; i++){    code = str.charCodeAt(i);    if(code >= 65281 && code <= 65374){      result += String.fromCharCode(str.charCodeAt(i) - 65248);    }else if (code == 12288){      result += String.fromCharCode(str.charCodeAt(i) - 12288 + 32);    }else{      result += str.charAt(i);    }  } return result;}

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