收集JavaScript中常用的方法函数

本文中，收集了一些比较常用的Javascript函数，希望对学习JS的朋友们有所帮助。

1. 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 + "..."
}

2. 替换全部

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

3. 清除空格

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

4. 清除左空格/右空格

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

5. 判断是否以某个字符串开头

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

6. 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)
}

7. 转义html标签

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

8. 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
}

9. 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
    }
}

10. 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;"
}

11. 获取cookie值

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

12. 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")
		}
	}
}

13. 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')
	}
}

14. 加载样式文件

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

15. 返回脚本内容

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

16. 清除脚本内容

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

17. 动态加载脚本文件

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

18. 返回按ID检索的元素对象

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

19. 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;
	}
}

20. 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;
	}
}

21. 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;
};

22. 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;
};

23. 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);
		 }
	}
}

24. 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;
}

25. 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];
}

26. 获取当前路径

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

27. 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;
}

28. 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()));
}

29. 判断是否苹果移动设备访问

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

30. 判断是否安卓移动设备访问

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

31. 判断是否Touch屏幕

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

32. 判断是否打开视窗

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

33. 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;
}

34. 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;
	}
}

35. 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;
}

36. 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;
    }
}

37. getElementsByClassName

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
}

38. 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);
}

39. 获取页面可视宽度

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

40. 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);
}

41. 获取页面scrollTop

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

42. 获取页面可视高度

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

43. 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;
}

44. 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());
}

45. 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("");
}

46. 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;
}

47. 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
	}
}

48. 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"));

49. 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() + 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;
}

50. 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;
}

51. 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]+$

52. 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');

53. 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];
}

54. 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();
	}
}

55. 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);

56. 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
};

57. 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;
}

58. 字符串反序

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

59. 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);
	}
}

60. 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);
	}
}

61. 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;
}

62. resize的操作

(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();
})();

63. 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;
}

64. 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('');
}

65. 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);
}

66. 断鼠标是否移出事件

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);
}

67. 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;
}

68. 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;
}

 http://www.open-open.com/code/view/1437099022568