常用Javascript函数与原型功能收藏

// 重复字符串
String.prototype.repeat = function(n) {
	return new Array(n+1).join(this);
}

// 替换全部
String.prototype.replaceAll = function(str1, str2) {
	return this.replace(new RegExp(str1, "gm"), str2);
}

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

// 计算数组中的最大值
Array.prototype.max = function() {
	return Math.max.apply({}, this);
}

// 计算数组中的最小值
Array.prototype.min = function() {
	return Math.min.apply({}, this);
}

// 复制数组
Array.prototype.copy = function() {
	return [].concat(this);
};

// 去除数组中指定元素，只能去除一个，如果想多个，之前先用unique处理
Array.prototype.remove = function(value){
	for (var i = 0, len = this.length; i < len; i++) {
		if (this[i] == value) {
			this.splice(i, 1);
			break;
		}
	}
	return this;
}

// 判断数组中是否存在指定元素，返回索引值
Array.prototype.inArray = function(value) {
	var index = -1, key;
	for (key in this) {
		if (this[key] == value) {
			index = key;
			break;
		}
	}
	return index;
}

// 去除数组中的重复元素
Array.prototype.unique = function() {
	var key, ret = [];
	for (key in this) {
		if (ret.inArray(this[key]) < 0) {
			ret.push(this[key]);
		}
	}
	return ret;
}

// 检测是否已经安装flash，检测flash的版本
var flashVersion = (function() {
	var version;
	try {
		version = navigator.plugins['Shockwave Flash'];
		version = version.description;
	} catch (ex) {
		try {
			version = new ActiveXObject('ShockwaveFlash.ShockwaveFlash')
				.GetVariable('$version');
		} catch (ex2) {
			version = '0.0';
		}
	}
	version = version.match(/\d+/g);
	return parseFloat(version[0] + '.' + version[1], 10);
})();

// 检测是否支持transition
var supportTransition = (function() {
	var s = document.createElement('p').style,
		r = 'transition' in s ||
		'WebkitTransition' in s ||
		'MozTransition' in s ||
		'msTransition' in s ||
		'OTransition' in s;
	s = null;
	return r;
})();

// 判断浏览器是否支持图片的base64
var isSupportBase64 = (function() {
	var data = new Image();
	var support = true;
	data.onload = data.onerror = function() {
		if (this.width != 1 || this.height != 1) {
			support = false;
		}
		return support;
	};
	data.src = "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///ywAAAAAAQABAAACAUwAOw==";
})();

// 首字母大写
function ucfirst(str) {
	return str.charAt(0).toUpperCase() + str.slice(1);
}

// 清除左空格
function ltrim(str) {
	return str.replace(/^(\s*|　*)/, "");
}

// 清除右空格
function rtrim(str) {
	return str.replace(/(\s*|　*)$/, "");
}

// 设置Cookie值
function setCookie(name, value, hours, path, domain) {
	var d = new Date();
	var offset = 8;
	var utc = d.getTime() + (d.getTimezoneOffset() * 60000);
	var nd = utc + (3600000 * offset);
	var expire = new Date(nd);
	expire.setTime(expire.getTime() + hours * 60 * 60 * 1000);
	var path = path || "";
	var domain = domain || "";
	document.cookie = name + "=" + escape(value) + ";path="+ path +";expires=" + expire.toGMTString() + ";domain="+ domain +";"
}

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

// 删除Cookie值
function removeCookie(name) {
	setCookie(name, "", -1);
}

// 生成范围随机数
function rand(n, m) {
	return Math.random() * (m - n) + n;
}

// 加入收藏夹
function addFavorite(url, title) {
	try {
		window.external.addFavorite(url, title);
	} catch(e) {
		try {
			window.sidebar.addPanel(title, url, "");
		} catch(e) {
			alert("加入收藏失败，请使用Ctrl+D进行添加");
		}
	}
}

// 设为首页
function setHomepage(url) {
	if (document.all) {
		document.body.style.behavior = 'url(#default#homepage)';
		document.body.setHomePage(url);
	} 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', url);
	}
}

// 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)
	}
}

// 清除脚本内容
function stripscript(str) {
	return str.replace(/<script.*?>.*?<\/script>/ig, '');
}

// 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代码
function formatCss(str){
	str = str.replace(/\s*([\{\}\:\;\,])\s*/g, "$1");
	str = str.replace(/;\s*;/g, ";"); //清除连续分号
	str = str.replace(/\,[\s\.\#\d]*{/g, "{");
	str = str.replace(/([^\s])\{([^\s])/g, "$1 {\n\t$2");
	str = str.replace(/([^\s])\}([^\n]*)/g, "$1\n}\n$2");
	str = str.replace(/([^\s]);([^\s\}])/g, "$1;\n\t$2");
	return str;
}

// 压缩CSS代码
function compressCss (str) {
	str = str.replace(/\/\*(.|\n)*?\*\//g, "");       //删除注释
	str = str.replace(/\s*([\{\}\:\;\,])\s*/g, "$1");
	str = str.replace(/\,[\s\.\#\d]*\{/g, "{");       //容错处理
	str = str.replace(/;\s*;/g, ";");                 //清除连续分号
	str = str.match(/^\s*(\S+(\s+\S+)*)\s*$/);        //去掉首尾空白
	return (str == null) ? "" : s[1];
}

// getElementsByClassName
function getElementsByClassName(name, context) {
	var context = context || document;
	if (context.getElementsByClassName) {
		return context.getElementsByClassName(name);
	}
	
	var nodes = context.getElementsByTagName("*"), nodesLength = nodes.length, ret = [];
	for (var i = 0; i < nodesLength; i++) {
		var className = nodes[i].className;
		if (nodes[i].nodeType == 1 && className) {
			var classes = className.split(' ');
			for (var j = 0; j < classes.length; j++) {
				if (name == classes[j]) {
					ret.push(nodes[i]);
					break
				}
			}
		}
	}
	return ret;
}

// 获取页面高度
function getPageHeight() {
	var doc = document;
	var rot = doc.compatMode == "BackCompat" ? doc.body : doc.documentElement;
	return Math.max(doc.documentElement.scrollHeight, doc.body.scrollHeight, rot.clientHeight);
}

// 获取页面scrollLeft
function getPageScrollLeft() {
	var doc = document;
	return doc.documentElement.scrollLeft || doc.body.scrollLeft;
}

// 获取页面可视宽度
function getPageViewWidth() {
	var doc = document;
	var rot = doc.compatMode == "BackCompat" ? doc.body : doc.documentElement;
	return rot.clientWidth;
}

// 获取页面宽度
function getPageWidth(){
	var doc = document;
	var rot = doc.compatMode == "BackCompat" ? doc.body : doc.documentElement;
	return Math.max(doc.documentElement.scrollWidth, doc.body.scrollWidth, rot.clientWidth);
}

// 获取页面scrollTop
function getPageScrollTop(){
	var doc = document;
	return doc.documentElement.scrollTop || doc.body.scrollTop;
}

// 获取页面可视高度
function getPageViewHeight() {
	var doc = document;
	var rot = doc.compatMode == "BackCompat" ? doc.body : doc.documentElement;
	return rot.clientHeight;
}

// 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
	}
}
// 获取元素的样式值
function getStyle(elem, name) {
	if (elem.style[name]) {
		return elem.style[name];
	} else if (elem.currentStyle) {
		return elem.currentStyle[name];
	} else if (document.defaultView && document.defaultView.getComputedStyle) {
		var s = document.defaultView.getComputedStyle(elem, "");
		return s && s.getPropertyValue(name);
	} else {
		return null;
	}
}

// 获取元素相对于这个页面的X坐标
function pageX(elem) {
	return elem.offsetParent ? (elem.offsetLeft + pageX(elem.offsetParent)) : elem.offsetLeft;
}

// 获取元素相对于这个页面的Y坐标
function pageY(elem) {
	return elem.offsetParent ? (elem.offsetTop + pageY(elem.offsetParent)) : elem.offsetTop;
}

// 获取元素相对于父元素的X坐标
function parentX(elem) {
	return elem.parentNode == elem.offsetParent ? elem.offsetLeft : pageX(elem) - pageX(elem.parentNode);
}

// 获取元素相对于父元素的Y坐标
function parentY(elem) {
	return elem.parentNode == elem.offsetParent ? elem.offsetTop : pageY(elem)-pageY(elem.parentNode);
}

// 获取使用CSS定位的元素的X坐标
function posX(elem) {
	return parseInt(getStyle(elem, "left"));
}

// 获取使用CSS定位的元素的Y坐标
function posY(elem) {
	return parseInt(getStyle(elem, "top"));
}

// 设置元素X位置
function setX(elem, pos) {
	elem.style.left = pos + "px";
}

// 设置元素Y位置
function setY(elem, pos) {
	elem.style.top = pos + "px";
}

// 增加元素X坐标
function addX(elem, pos) {
	set(elem, (posX(elem) + pos));
}

// 增加元素Y坐标
function addY(elem, pos) {
	set(elem, (posY(elem) + pos));
}

// 获取元素使用CSS控制大小的高度
function getHeight(elem) {
	return parseInt(getStyle(elem, "height"));
}

// 获取元素使用CSS控制大小的宽度
function getWidth(elem) {
	return parseInt(getStyle(elem, "width"));
}

// 设置透明度
function setOpacity(elem, num) {
	if (elem.filters) {
		elem.style.filter="alpha(opacity="+ num +")";
	} else {
		elem.style.opacity = num/100;
	}
}

// 获取鼠标光标相对于整个页面的X位置
function getX(e) {
	e = e || window.event;
	return e.pageX || e.clientX + document.body.scrollLeft;
}

// 获取鼠标光标相对于整个页面的Y位置
function getY(e) {
	e = e || window.event;
	return e.pageY || e.clientY + document.body.scrollTop;
}

// 获取鼠标光标相对于当前元素的X位置
function getElementX(e) {
	return (e && e.layerX) || window.event.offsetX;
}

// 获取鼠标光标相对于当前元素的Y位置
function getElementY(e) {
	return (e && e.layerY) || window.event.offsetY;
}

// 获取滚动条的X位置
function scrollX() {
	var de = document.documentElement;
	return self.pageXOffset || (de && de.scrollLeft) || document.body.scrollLeft;
}

// 获取滚动条的Y位置
function scrollY() {
	var de = document.documentElement;
	return self.pageYOffset || (de && de.scrollTop) || document.body.scrollTop;
}

// 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;
}

// 获得URL中GET参数值
function getParams() {
	var queryStr = window.location.href.split("?");
	var params = [];
	if (queryStr[1]) {
		var gets = queryStr[1].split("&");
		for (var i = 0; i < gets.length; i++) {
			temp = gets.split("=");
			params[temp[0]] = temp[1];
		}
	}
	return params;
}

// 字符串反序
function strReverse(text) {
	return text.split('').reverse().join('');
}

// HTML实体
function htmlEncode(str) {
	var s = "";
	if (str.length == 0) return "";
	s = str.replace(/\&/g, "&amp;");
	s = s.replace(/</g, "&lt;");
	s = s.replace(/>/g, "&gt;");
	s = s.replace(/\'/g, "&#039;");
	s = s.replace(/\"/g, "&qout;");
	return s;
}

// HTML还原
function htmlDecode(str) {
	var s = "";
	if (str.length == 0) return "";
	s = str.replace(/&amp;/g, "&");
	s = s.replace(/&lt;/g, "<");
	s = s.replace(/&gt;/g, ">");
	s = s.replace(/&#039;/g, "\'");
	s = s.replace(/&qout;/g, "\"");
	return s;
}

// 克隆
function clone(obj) {
	var ret;
	switch (typeof obj) {
		case 'undefined':
			break;
		case 'string':
			ret = obj + '';
			break;
		case 'number':
			ret = obj - 0;
			break;
		case 'boolean':
			ret = obj;
			break;
		case 'object':
			if (obj === null) {
				ret = null;
			} else {
				if (obj instanceof Array) {
					ret = [];
					for (var i = 0, len = obj.length; i < len; i++) {
						ret.push(clone(obj[i]));
					}
				} else {
					ret = {};
					for (var k in obj) {
						ret[k] = clone(obj[k]);
					}
				}
			}
			break;
		default:
			ret = obj;
			break;
	}
	return ret;
}

// 检测变量是否为email格式
function isEmail(mail) {
	if (/^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$/.test(mail)) {
		return true;
	}
	return false;
}

// 验证身份证号码
function isIdenCode(code){
	var city={11:"北京",12:"天津",13:"河北",14:"山西",15:"内蒙古",21:"辽宁",22:"吉林",23:"黑龙江 ",31:"上海",32:"江苏",33:"浙江",34:"安徽",35:"福建",36:"江西",37:"山东",41:"河南",42:"湖北 ",43:"湖南",44:"广东",45:"广西",46:"海南",50:"重庆",51:"四川",52:"贵州",53:"云南",54:"* ",61:"陕西",62:"甘肃",63:"青海",64:"宁夏",65:"*",71:"*",81:"香港",82:"澳门",91:"国外"};
	var tip  = "";
	var pass = true;
	if (!code || !/^\d{6}(18|19|20)?\d{2}(0[1-9]|1[012])(0[1-9]|[12]\d|3[01])\d{3}(\d|X)$/i.test(code)) {
		tip  = "身份证号格式错误";
		pass = false;
	} else if (!city[code.substr(0,2)]) {
		tip  = "地址编码错误";
		pass = false;
	} else {
		//18位身份证需要验证最后一位校验位
		if(code.length == 18){
			code = code.split('');
			//∑(ai×Wi)(mod 11)
			//加权因子
			var factor = [ 7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2 ];
			//校验位
			var parity = [ 1, 0, 'X', 9, 8, 7, 6, 5, 4, 3, 2 ];
			var sum = 0;
			var ai  = 0;
			var wi  = 0;
			for (var i = 0; i < 17; i++) {
				ai = code[i];
				wi = factor[i];
				sum += ai * wi;
			}
			
			var last = parity[sum % 11];
			if (parity[sum % 11] != code[17]) {
				tip = "校验位错误";
				pass = false;
			}
		}
	}
	return pass;
}

// 检测变量是否为小数
function isDecimal(dec){
	if (dec.match(/^-?\d+(\.\d+)?$/g) == null) {
		return false;
	}
	return true;
}

// 检测变量是否为整型
function isInteger(num){
	if (num.match(/^[-+]?\d*$/) == null) {
		return false;
	}
	return true;
}

// 检测变量是否为时间格式
function checkTime(str) {
	var time = str.match(/^(\d{1,2})(:)?(\d{1,2})\2(\d{1,2})$/);
	if (time == null) {
		return false;
	}
	
	if (time[1] > 24 || time[3] > 60 || time[4] > 60) {
		return false
	}
	return true;
}

// 检测变量类型是否为日期格式
function checkDate(str) {
	var date = str.match(/^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2})$/);
	if (date == null) {
		return false;
	}
	
	var d = new Date(r[1], r[3]-1, r[4]);
	return (d.getFullYear() == r[1] && (d.getMonth()+1) == r[3] && d.getDate() == r[4]);
}

// 检测变量是否为长日期格式
function checkDateTime(str) {
	var reg = /^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2}) (\d{1,2}):(\d{1,2}):(\d{1,2})$/;
	var dt = str.match(reg);
	if (dt == null) {
		return false;
	}
	
	var d = new Date(dt[1], dt[3]-1, dt[4], dt[5], dt[6], dt[7]);
	return (d.getFullYear() == dt[1] && (d.getMonth()+1) == dt[3] && d.getDate() == dt[4] && d.getHours() == dt[5] && d.getMinutes() == dt[6] && d.getSeconds() == dt[7]);
}

// 检测变量是否为未定义
function isUndefined(val) {
	return typeof val === 'undefined';
}

// 检测变量是否为定义
function isDefined(val) {
	return typeof val !== 'undefined';
}

// 检测变量类型是否为对象
function isObject(val) {
  return val !== null && typeof val === 'object';
}

// 检测变量类型是否为空对象
function isBlankObject(val) {
  return val !== null && typeof val === 'object' && !Object.getPrototypeOf(val);
}

// 检测变量类型是否为字符串
function isString(val) {
	return typeof val === 'string';
}

// 检测变量类型是否为数字
function isNumber(val) {
	return typeof val === 'number';
}

// 检测变量类型是否为日期
function isDate(val) {
	return toString.call(val) === '[object Date]';
}

// 检测变量类型是否为函数
function isFunction(val) {
	return typeof val === 'function';
}

// 检测变量类型是否为正则表达式
function isRegExp(val) {
	return toString.call(val) === '[object RegExp]';
}

// 检测变量是否window窗体对象
function isWindow(obj) {
	return obj && obj.window === obj;
}

// 检测变量类型是否为布尔
function isBoolean(val) {
	return typeof val === 'boolean';
}

// 检测变量类型是否为文件对象
function isFile(obj) {
	return toString.call(obj) === '[object File]';
}

// 检测变量类型是否为表单对象
function isFormData(obj) {
	return toString.call(obj) === '[object FormData]';
}

// 检测变量类型是否为二进制对象
function isBlob(obj) {
	return toString.call(obj) === '[object Blob]';
}

// 转全角字符
function toDBC(str) {
	var result = "";
	var len = str.length;
	for (var i = 0; i < len; i++) {
		var code = str.charCodeAt(i);
		//全角与半角相差（除空格外）：65248(十进制)
		code = (code >= 0x0021 && code <= 0x007E) ? (code + 65248) : code;
		//处理空格
		code = (code == 0x0020) ? 0x03000 : code;
		result += String.fromCharCode(code);
	}
	return result;
}

// 转半角字符
function toSBC(str) {
	var result = "";
	var len = str.length;
	for (var i = 0; i < len; i++) {
		var code = str.charCodeAt(i);
		//全角与半角相差（除空格外）：65248（十进制）
		code = (code >= 0xFF01 && code <= 0xFF5E) ? (code - 65248) : code;
		//处理空格
		code = (code == 0x03000) ? 0x0020 : code;
		result += String.fromCharCode(code);
	}
	return result;
}

// 全角半角转换
// angle: 0全到半，1半到全，其他不转化
function chgAngle(str, angle) {
	if (typeof str != "string" || str.length <= 0 || !(angle === 0 || angle == 1)) {
		return str;
	}
	
	var i, len, ret = [], code;
	if (angle) {
		/*半->全*/
		for (i = 0, len = str.length; i < len; i++) {
			code = str.charCodeAt(i);
			if (code == 32) {
				code = 12288;
			} else if (code < 127) {
				code += 65248;
			}
			ret.push(String.fromCharCode(code));
		}
	} else {
		/*全->半*/
		for (i = 0, len = str.length; i < len; i++) {
			code = str.charCodeAt(i);
			if (code == 12288) {
				code = 32;
			} else if (code > 65280 && code < 65375) {
				code -= 65248;
			}
			ret.push(String.fromCharCode(code));
		}
	}
	return ret.join("");
}

// 数据的本地化存储
function makeWebStorage() {
	//IE用userdata实现，w3c浏览器本身支持
	if (("localStorage" in window)) {
		var store = {
			set    : function(key, value) {localStorage.setItem(key, value)},
			get    : function(key)        {return localStorage.getItem(key)},
			remove : function(key)        {return localStorage.removeItem(key)}
		}
	} else {
		var store = {
			userData : null,
			name     : location.hostname,
			init     : function () {
				if (!store.userData) {
					try {
						store.userData = document.createElement('INPUT');
						store.userData.type = "hidden";
						store.userData.style.display = "none";
						store.userData.addBehavior("#default#userData");
						document.body.appendChild(store.userData);
						var expires = new Date();
						expires.setDate(expires.getDate() + 365);
						store.userData.expires = expires.toUTCString();
					} catch (e) {
						return false;
					}
				}
				return true;
			},
			setItem : function(key, value) {
				if (store.init()) {
					store.userData.load(store.name);
					store.userData.setAttribute(key, value);
					store.userData.save(store.name);
				}
			},
			getItem : function(key) {
				if (store.init()) {
					store.userData.load(store.name);
					return store.userData.getAttribute(key);
				}
			},
			remove : function(key) {
				if (store.init()) {
					store.userData.load(store.name);
					store.userData.removeAttribute(key);
					store.userData.save(store.name);
				}
			}
		};
	}
	window.webStorage = store;
}

function makeSessionStorage() {
	if (("sessionStorage" in window)) {
		var store = {
			set    : function(key, value) {window.sessionStorage.setItem(key, value)},
			get    : function(key)        {return window.sessionStorage.getItem(key)},
			remove : function(key)        {return window.sessionStorage.removeItem(key)}
		}
	} else {
		var store = {
			set    : function(key, value) {},
			get    : function(key)        {},
			remove : function(key)        {}
		}
	}
	window.sessStorage = store;
}