100个直接可以拿来用的JavaScript实用功能代码片段（重新排版+目录浏览）

摘要：来自本文原作者发表于由于浏览器及的快速迭代发展，以下部分代码功能可能会失效过时或者不够优雅还请看官自行斟辨。重新使用排版，且自动生成了目录方便浏览。

来自：http://www.cnblogs.com/wxydigua/p/3314274.html

本文原作者发表于：2013-09-11, 由于浏览器及ECMAScript的快速迭代发展，以下部分代码功能可能会失效、过时或者不够优雅, 还请看官自行斟辨。      
重新使用 markdown 排版，且自动生成了目录方便浏览。

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 + "..."
}

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;
}

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

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

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

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

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
}

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

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;"
}

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

 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")
         }
     }
 }    

function setHomepage() {
        if (document.all) {
            document.body.style.behavior = "url(#default#homepage)";
            document.body.setHomePage("http://***")
        } 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://***")
        }
    }

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

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)
    }
}

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

function stripscript(s) {
     return s.replace(/.*?/ig, "");
 }

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) {}
}

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

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;
}

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" : "";
    }
}

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

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

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

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); 
        } 
    } 
}

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 {
	$2");
    s = s.replace(/([^s])}([^
]*)/g, "$1
}
$2");
    s = s.replace(/([^s]);([^s}])/g, "$1;
	$2");
    return s;
}

function yasuoCss (s) {//压缩代码
    s = s.replace(//*(.|
)*?*//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];
}

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

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;
}

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;
}

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;
        }
    }
}

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;
}

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

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

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

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

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;
}

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

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;
}

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;
    }
}

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;
}

function IsURL(strUrl) {
    var regular = /^(((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)|(1dd)|([1-9]d)|d))(/[-a-z0-9_:@&?=+,.!/~%$]*)?)$/i
    if (regular.test(strUrl)) {
        return true;
    }
    else {
        return false;
    }
}

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
}

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

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

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

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);
}

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

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

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);
}

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

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

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;
    }
}

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;
    }
}

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;
}

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

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半*/
        for(i=0; i 65280 && iCode < 65375){
                iCode -= 65248;                
            }
            oRs.push(String.fromCharCode(iCode)); 
        }        
    }        
    return oRs.join("");        
}

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;
}

function getScrollXY() {
    return document.body.scrollTop ? {
        x: document.body.scrollLeft,
        y: document.body.scrollTop
    }: {
        x: document.documentElement.scrollLeft,
        y: document.documentElement.scrollTop
    }
}

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"));

/*
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;
}

// 针对火狐不支持offsetX/Y
function 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;
}

//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*)?$/;
//年/月/日（年-月-日、年.月.日）
/^(19|20)dd[- /.](0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])$/;
//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}$/;
//匹配空白行的正则表达式
/
s*
/;
//匹配中国邮政编码
/[1-9]d{5}(?!d)/;
//匹配身份证
/d{15}|d{18}/;
//匹配国内电话号码
/(d{3}-|d{4}-)?(d{8}|d{7})?/;
//匹配IP地址
/((2[0-4]d|25[0-5]|[01]?dd?).){3}(2[0-4]d|25[0-5]|[01]?dd?)/;
//匹配首尾空白字符的正则表达式
/^s*|s*$/;
//匹配HTML标记的正则表达式
< (S*?)[^>]*>.*?|< .*? />;

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");

// 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
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
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
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
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;
        else
            return 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;
    else
        return 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;
    else
        return true;
}

77、原生JavaScript判断字符串是否为浮点数
function isFloat( str ) {
    for(i=0;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;
    else
        return 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;
    else
        return 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("
").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(/[
]+/);
    var y="";
    for(var i=0;i
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(/[
]/).sort().join("
");//顺序
     var test=K1.value.split(/[
]/).sort().reverse().join("
");//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(/[sS]*?|s+on[a-zA-Z]{3,16}s?=s?"[sS]*?"|s+on[a-zA-Z]{3,16}s?=s?"[sS]*?"|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 
"+script+"
 If Err.Number<>0 Then 
 MsgBox "请输入正确的VBScript脚本!",48,"脚本错误!" 
 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：
[s| ]*
 
匹配 HTML 标记的正则表达式：<(.*)>.*|<(.*) />
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}-))?((0d{2,3})|0d{2,3}-)?[1-9]d{6,7}(-d{1,4})?$ 
手机号码：^(((d{2,3}))|(d{3}-))?13d{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：<(.*)>.*|<(.*) /> 
匹配空行：
[s| ]*
 
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*13d{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：^0d{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 = "",
        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;
}