JavaScript 常用的代码片段

Question

• 转义特殊字符为 html 实体

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

• 验证是否为有效的手机电话号码

IsMobile: function(str){
var rp = /^1[3|4|5|7|8][0-9]\d{4,8}$/;
return rp.test(str);
},

• 验证是否为有效的座机电话号码

IsTel: function(str){
var rp = /^([0-9]{3,4}-)?[0-9]{7,8}$/;
return rp.test(str);
},

• 判断是那种类型的浏览器

WhichBrowser: function(){
var userAgent = navigator.userAgent;

var isOpera = userAgent.indexOf("Opera") > -1;
var isIE = userAgent.indexOf("compatible") > -1 && userAgent.indexOf("MSIE") > -1 && !isOpera;
var isFF = userAgent.indexOf("Firefox") > -1;
var isCH = userAgent.indexOf("Chrome") > -1;
var isSafari = userAgent.indexOf("Safari") > -1;

if (isIE){
var IE5 = IE55 = IE6 = IE7 = IE8 = false;
var reIE = new RegExp("MSIE (\\d+\\.\\d+);");
reIE.test(userAgent);
var fIEVersion = parseFloat(RegExp["$1"]);
IE55 = fIEVersion == 5.5;
IE6 = fIEVersion == 6.0;
IE7 = fIEVersion == 7.0;
IE8 = fIEVersion == 8.0;
if (IE55) {
return "IE55";
}
if (IE6) {
return "IE6";
}
if (IE7) {
return "IE7";
}
if (IE8) {
return "IE8";
}
}

if (isFF) {
return "Firefox";
}
if (isCH) {
return "Chrome";
}
if (isOpera) {
return "Opera";
}
if (isSafari) {
return "Safari";
}
},

• 获取客户端浏览器 cookie

GetCookie: function(c_name){
if(document.cookie.length>0){
c_start = document.cookie.indexOf(c_name + '=');
if(c_start != -1){
c_start = c_start + c_name.length + 1;
c_end = document.cookie.indexOf(';',c_start);
if (c_end==-1) c_end = document.cookie.length;
return unescape(document.cookie.substring(c_start,c_end));
}
}
return '';
},

• 设置客户端浏览器 cookie

SetCookie: function(c_name, value, expiredays){
var exdate = new Date();
exdate.setDate(exdate.getDate() + expiredays);
document.cookie = c_name + "=" + escape(value) + ((expiredays==null) ? "" : ";expires="+exdate.toGMTString());
},
};

• 字符串长度截取

function cutstr(str, len) {
    var temp,
        icount = 0,
        patrn = /[^\x00-\xff]/，
        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 + "..."
}

• 替换全部

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

• 清除空格

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

• 清除左空格/右空格

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

• 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)
}

• 转义 html 标签

function HtmlEncode(text) {
    return text.replace(/&/g, '&').replace(/\"/g, '"').replace(/</g, '<').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://w3cboy.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://w3cboy.com')
    }
}

• 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('<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;
}

• 清除脚本内容

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

• 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);
}

• 跨浏览器绑定事件

function addEventSamp(obj,evt,fn){ 
    if(!oTarget){return;}
    if (obj.addEventListener) { 
        obj.addEventListener(evt, fn, false); 
    }else if(obj.attachEvent){ 
        obj.attachEvent('on'+evt,fn); 
    }else{
        oTarget["on" + sEvtType] = fn;
    } 
}

• 跨浏览器删除事件

function delEvt(obj,evt,fn){
    if(!obj){return;}
    if(obj.addEventListener){
        obj.addEventListener(evt,fn,false);
    }else if(oTarget.attachEvent){
        obj.attachEvent("on" + evt,fn);
    }else{
        obj["on" + evt] = fn;
    }
}

• 为元素添加 on 方法

Element.prototype.on = Element.prototype.addEventListener;
 
NodeList.prototype.on = function (event, fn) {、
    []['forEach'].call(this, function (el) {
        el.on(event, fn);
    });
    return this;
};

• 为元素添加 trigger 方法

Element.prototype.trigger = function (type, data) {
    var event = document.createEvent('HTMLEvents');
    event.initEvent(type, true, true);
    event.data = data || {};
    event.eventName = type;
    event.target = this;
    this.dispatchEvent(event);
    return this;
};
 
NodeList.prototype.trigger = function (event) {
    []['forEach'].call(this, function (el) {
        el['trigger'](event);
    });
    return this;
};

• 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 compressCss (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();
}

• 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;
    }
}

• 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;
}

• 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;
}

• 日期格式化函数+调用方法

Date.prototype.format = function(format){
    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"));

• 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*)?$/;
或：^http:\/\/[A-Za-z0-9]+\.[A-Za-z0-9]+[\/=\?%\-&_~`@[\]\':+!]*([^<>\"\"])*$ 
//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*$/;
//匹配 HTML 标记的正则表达式
< (\S*?)[^>]*>.*?|< .*? />;
//sql 语句
^(select|drop|delete|create|update|insert).*$
//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+)
//取信息中的中国手机号码
(86)*0*13\d{9} 
//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+)?
//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]+$

• 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 = [];
        for(i=0;i<GETs.length;i++){
              tmp_arr = GETs.split("=")
              key=tmp_arr[0]
              GET[key] = tmp_arr[1]
        }
    }
    return querystr[1];
}

• 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();
    }
}

• 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);

• 清除相同的数组

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

• 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;
}

• 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,"");
}
动态执行 JavaScript 脚本
 
function javascript(){
    try{
      eval(K1.value);
    }catch(e){
      alert(e.message);
    }
}

• 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 = temp;
    }
    return value;
}

• 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);
}