前端开发JS常用方法函数汇总

前端开发自学方法|前端开发页面优化方法|web前端js开发工具

字符串长度截取

[code]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 + “…”
}[/code]

替换全部

[code]String.prototype.replaceAll = function(s1, s2) {
return this.replace(new RegExp(s1, “gm”), s2)
}[/code]

清除空格

[code]String.prototype.trim = function() {
var reExtraSpace = /^\s(.?)\s+$/;
return this.replace(reExtraSpace, “$1”)
}[/code]

清除左空格/右空格

[code]function ltrim(s){ return s.replace( /^(\s| )/, “”); }
function rtrim(s){ return s.replace( /(\s| )$/, “”); }[/code]

判断是否以某个字符串开头

[code]String.prototype.startWith = function (s) {
return this.indexOf(s) == 0
}[/code]

判断是否以某个字符串结束

[code]String.prototype.endWith = function (s) {
var d = this.length – s.length;
return (d >= 0 && this.lastIndexOf(s) == d)
}[/code]

转义html标签

[code]function HtmlEncode(text) {
return text.replace(/&/g, ‘&’).replace(/\”/g, ‘”‘).replace(/</g, ‘<‘).replace(/>/g, ‘>’)
}[/code]

时间日期格式转换

[code]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
}[/code]

判断是否为数字类型

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

设置cookie值

[code]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;”
}[/code]

获取cookie值

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

加入收藏夹

[code]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”)
}
}
}[/code]

设为首页

[code]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’)
}
}[/code]

加载样式文件

[code]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)
}
}[/code]

返回脚本内容

[code]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;
}[/code]

清除脚本内容

[code]function stripscript(s) {
return s.replace(/<script.?>.?<\/script>/ig, ”);
}[/code]

动态加载脚本文件

[code]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) {}

}[/code]

返回按ID检索的元素对象

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

跨浏览器绑定事件

[code]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;
}
}[/code]

跨浏览器删除事件

[code]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;
}
}[/code]

为元素添加on方法

[code]Element.prototype.on = Element.prototype.addEventListener;

NodeList.prototype.on = function (event, fn) {、
[][‘forEach’].call(this, function (el) {
el.on(event, fn);
});
return this;
};[/code]

为元素添加trigger方法

[code]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’;
});
return this;
};[/code]

检验URL链接是否有效

[code]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);
}
}
}[/code]

格式化css样式代码

[code]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;
}[/code]

压缩css样式代码

[code]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];
}[/code]

获取当前路径

[code]var currentPageUrl = “”;
if (typeof this.href === “undefined”) {
currentPageUrl = document.location.toString().toLowerCase();
}else {
currentPageUrl = this.href.toString().toLowerCase();
}[/code]

判断是否移动设备

[code]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;
}[/code]

判断是否移动设备访问

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

判断是否安卓移动设备访问

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

判断是否Touch屏幕

[code]function isTouchScreen(){
return ((‘ontouchstart’ in window) || window.DocumentTouch && document instanceof DocumentTouch);
}[/code]

判断是否打开视窗

[code]function isViewportOpen() {
return !!document.getElementById(‘wixMobileViewport’);
}[/code]

获取移动设备初始化大小

[code]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;
}[/code]

获取移动设备最大化大小

[code]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;
}
}[/code]

获取移动设备屏幕宽度

[code]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;
}[/code]

完美判断是否为网址

[code]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;
}
}[/code]

getElementsByClassName

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

获取页面高度

[code]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);
}[/code]

获取页面scrollLeft

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

获取页面可视宽度

[code]function getPageViewWidth(){
var d = document, a = d.compatMode == “BackCompat”
? d.body
: d.documentElement;
return a.clientWidth;
}[/code]

获取页面宽度

[code]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);
}[/code]

获取页面scrollTop

[code]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);
}[/code]

获取页面可视高度

[code]function getPageViewHeight() {
var d = document, a = d.compatMode == “BackCompat”
? d.body
: d.documentElement;
return a.clientHeight;
}[/code]

去掉url前缀

[code]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;
}[/code]

随机数时间戳

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

全角半角转换

[code]//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(“”);
}[/code]

确认是否键盘有效输入值

[code]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;
}[/code]

获取网页被卷去的位置

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

日期格式化函数+调用方法

[code]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”));[/code]

时间个性化输出功能

[code]/
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() + 10,
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;

}[/code]

解决offsetX兼容性问题

[code]// 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;
}[/code]

常用的正则表达式

[code]//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– /.– /.$/;
//匹配中文字符
/[\u4e00-\u9fa5]/;
//匹配帐号是否合法(字母开头,允许5-10字节,允许字母数字下划线)
/^[a-zA-Z][a-zA-Z0-9_]{4,9}$/;
//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)013\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]+$[/code]

返回顶部的通用方法

[code]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’);[/code]

获得URL中GET参数值

[code]// 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];
}[/code]

打开一个窗体通用方法

[code]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();
}
}[/code]

提取页面代码中所有网址

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

清除相同的数组

[code]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
};[/code]

按字母排序,对每行进行数组排序

[code]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;
}[/code]

字符串反序

[code]function IsReverse(text){
return text.split(”).reverse().join(”);
}[/code]

清除html代码中的脚本

[code]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);
}
}[/code]

动态执行VBScript脚本

[code]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);
}
}[/code]

金额大写转换函数

[code]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;
}[/code]

resize的操作

[code](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();
})();[/code]

实现base64解码

[code]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;
}[/code]

实现utf8解码

[code]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(”);
}[/code]

获取窗体可见范围的宽与高

[code]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);
}[/code]

判断鼠标是否移出事件

[code]function isMouseOut(e, handler) {
if (e.type !== ‘mouseout’) {
return false;
}
var reltg = e.relatedTarget ? e.relatedTarget : e.type === ‘mouseout’ ? e.toElement : e.fromElement;
while (reltg && reltg !== handler) {
reltg = reltg.parentNode;
}
return (reltg !== handler);
}[/code]

半角转换为全角函数

[code]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;
}[/code]

全角转换为半角函数

[code]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;
}[/code]

阻止浏览器默认事件

[code]function stopDefault( ev ) {
//阻止默认浏览器动作(W3C)
if ( ev && ev.preventDefault )
ev.preventDefault();
//IE中阻止函数器默认动作的方式
else
window.event.returnValue = false;
return false;
};[/code]

阻止冒泡

[code]function stopPropagation(e) {
e = e || window.event;
if(e.stopPropagation) { //W3C阻止冒泡方法
e.stopPropagation();
} else {
e.cancelBubble = true; //IE阻止冒泡方法
}
} [/code]

trim验证表单

[code]s != null && s.trim().length() > 0[/code]

简单的表单验证,重点在于电话的验证

[code]function fnForm_set(){
var user_name = document.querySelector(‘#js_username’).value.trim();
var user_tel = document.querySelector(“#js_tel”).value.trim();
if(user_name == null || user_name.length==0)
{
alert(‘请输入用户名’)
stopDefault();
}
else if ((/^0?(13[0-9]|15[012356789]|18[0236789]|14[57])[0-9]{8}$/g.test(user_tel))||(/^13\d{9}$/g.test(user_tel)) || (/^15[0-35-9]\d{8}$/g.test(user_tel)) || (/^18[05-9]\d{8}$/g.test(user_tel)))
{
//alert(“验证完成”);
return true;
}else if(user_tel == null || user_tel.length==0){
alert(‘请输入电话号码’);
stopDefault();
}else{
alert(‘请输入合法的电话号码’);
stopDefault();
};
};[/code]

获取json的长度

[code]function getJsonLength(jsonData){

var jsonLength = 0;

for(var item in jsonData){

jsonLength++;

}

return jsonLength;

}[/code]
感觉那个种cookie的办法不好使,换一个。
[code]function addCookie(name, value, expiresDays){
var cookieString = name + “=” + escape(value);
//判断是否设置过期时间
if(expiresDays > 0) {
var date = new Date();
date.setTime(date.getTime + expiresDays 24 3600 * 1000);
cookieString = cookieString + “; expires=” + date.toGMTString();
};
document.cookie = cookieString;
}
function getCookie(name){
var strCookie = document.cookie;
var arrCookie = strCookie.split(“; “);

for(var i = 0;i < arrCookie.length;i++){ 
    var arr = arrCookie[i].split("="); 
    if(arr[0] == name) return arr[1]; 
}
return ""; 

};
[/code]

为数组添加indexOf方法,以此兼容低版本浏览器
[code]Array.prototype.indexOf = Array.prototype.indexOf || function(el){
for (var i=0,n=this.length; i<n; i++){
if (this[i] === el){
return i;
}
}
return -1;
}
[/code]

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