javascript常用函数

实现字符串长度截

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 + "..."
    }

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;
}

清除空格

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

替换全部

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

转义html标签

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

生JavaScript还原html标签

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

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
    }

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
        }
    }

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;"
    }

#获取cookie值

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

#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")
            }
        }
    }

#设为首页

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://***')
        }
    }

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) {
     }
    }

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)
        }
    }

返回脚本内容

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

清除脚本内容

function stripscript(s) {
     
    return s.replace(/, '');
 }

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) {
     }
    }

返回按ID检索的元素对象

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

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;
    }

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' : '';
        }
    }
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); 
    } 
}

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); 
    } 
}

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(); 
}

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); 
        } 
    } 
}

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;
}

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];
}

获取当前路径

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

IP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;
}

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;
}

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;
        }
    }
}

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;
}

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()));
 }

判断是否苹果移动设备访问

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

判断是否安卓移动设备访问

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

判断是否Touch屏幕

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

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;
}

判断是否打开视窗

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

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;
}

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;
    }
}

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;
}

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;
    }
}

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
}

判断是否以某个字符串开头

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

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)
}

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
}

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);
}

获取页面scrollLeft

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

获取页面可视宽度

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

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);
}

获取页面scrollTop

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

获取页面可视高度

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

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;
    }
}

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;
    }
}

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;
}

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());
}

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("");        
}

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;
}

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
    }
}

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"));

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;
}

解决offsetX兼容性问题

// 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;
}

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*?)[^>]*>.*?|< .*? />;

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');

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];
}

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;
        }
    }
}

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;
    }
}

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();
    }
}

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;
}

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 ;                
    }    
}

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;
    }            
}

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;
    }    
}

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;
    }    
}

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;
}

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;
}

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;
}

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;
}

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;
}

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;
}

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;
}

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;
}

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)

用正则表达式清除相同的数组(低效率)

1 Array.prototype.unique=function(){
     
2     return this.reverse().join(",").match(/([^,]+)(?!.*\1)/ig).reverse();
3 }
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
}

用正则表达式按字母排序，对每行进行数组排序

1 function SetSort(){
     
2     var text=K1.value.split(/[\r\n]/).sort().join("\r\n");//顺序
3     var test=K1.value.split(/[\r\n]/).sort().reverse().join("\r\n");//反序
4     K1.value=K1.value!=text?text:test;
5 }

字符串反序

1 function IsReverse(text){
     
2     return text.split('').reverse().join('');
3 }

用正则表达式清除html代码中的脚本

1 function clear_script(){
     
2   K1.value=K1.value.replace(/,"");
3 }

动态执行JavaScript脚本

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

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);
    }
}

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;
}

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]+$

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();
})();

用正则清除空格分左右

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

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;
}

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;
}

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('');
}

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);
}

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 ;
}());

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;
}
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;
}

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;