<head> ???<title>测试JS扩展方法</title> ???<script type="text/javascript"> ???????// 合并多个空白为一个空白 ?????????String.prototype.ResetBlank = function() { ???????//对字符串扩展 ???????????var regEx = /\s+/g; ?????????????return this.replace(regEx, ‘ ‘); ?????????}; ?????????window.onload = function() ???????{ ???????????var str = "你 ?????在他想还好吗?"; ???????????alert(str); ???????????str = str.ResetBlank(); ???????//这样就能够调用了，跟C#的很像吧! ???????????alert(str); ???????} ???</script></head>
// 清除两边的空格 ?String.prototype.trim = function() { ?????return this.replace(/(^\s*)|(\s*$)/g, ‘‘); ?}; ?// 合并多个空白为一个空白 ?String.prototype.ResetBlank = function() { ?????var regEx = /\s+/g; ?????return this.replace(regEx, ‘ ‘); ?}; ???// 保留数字 ?String.prototype.GetNum = function() { ?????var regEx = /[^\d]/g; ?????return this.replace(regEx, ‘‘); ?}; ???// 保留中文 ?String.prototype.GetCN = function() { ?????var regEx = /[^\u4e00-\u9fa5\uf900-\ufa2d]/g; ?????return this.replace(regEx, ‘‘); ?}; ???// String转化为Number ?String.prototype.ToInt = function() { ?????return isNaN(parseInt(this)) ? this.toString() : parseInt(this); ?}; ???// 得到字节长度 ?String.prototype.GetLen = function() { ?????var regEx = /^[\u4e00-\u9fa5\uf900-\ufa2d]+$/; ?????if (regEx.test(this)) { ?????????return this.length * 2; ?????} else { ?????????var oMatches = this.match(/[\x00-\xff]/g); ?????????var oLength = this.length * 2 - oMatches.length; ?????????return oLength; ?????} ?}; ???// 获取文件全名 ?String.prototype.GetFileName = function() { ?????var regEx = /^.*\/([^\/\?]*).*$/; ?????return this.replace(regEx, ‘$1‘); ?}; ???// 获取文件扩展名 ?String.prototype.GetExtensionName = function() { ?????var regEx = /^.*\/[^\/]*(\.[^\.\?]*).*$/; ?????return this.replace(regEx, ‘$1‘); ?}; ???//替换所有String.prototype.replaceAll = function(reallyDo, replaceWith, ignoreCase) { ?????if (!RegExp.prototype.isPrototypeOf(reallyDo)) { ?????????return this.replace(new RegExp(reallyDo, (ignoreCase ? "gi" : "g")), replaceWith); ?????} else { ?????????return this.replace(reallyDo, replaceWith); ?????} ?}; ?//格式化字符串 add By 刘景宁 2010-12-09 ??String.Format = function() { ?????if (arguments.length == 0) { ?????????return ‘‘; ?????} ???????if (arguments.length == 1) { ?????????return arguments[0]; ?????} ???????var reg = /{(\d+)?}/g; ?????var args = arguments; ?????var result = arguments[0].replace(reg, function($0, $1) { ?????????return args[parseInt($1) + 1]; ?????}); ?????return result; ?}; ???// 数字补零 ?Number.prototype.LenWithZero = function(oCount) { ?????var strText = this.toString(); ?????while (strText.length < oCount) { ?????????strText = ‘0‘ + strText; ?????} ?????return strText; ?}; ???// Unicode还原 ?Number.prototype.ChrW = function() { ?????return String.fromCharCode(this); ?}; ???// 数字数组由小到大排序 ?Array.prototype.Min2Max = function() { ?????var oValue; ?????for (var i = 0; i < this.length; i++) { ?????????for (var j = 0; j <= i; j++) { ?????????????if (this[i] < this[j]) { ?????????????????oValue = this[i]; ?????????????????this[i] = this[j]; ?????????????????this[j] = oValue; ?????????????} ?????????} ?????} ?????return this; ?}; ???// 数字数组由大到小排序 ?Array.prototype.Max2Min = function() { ?????var oValue; ?????for (var i = 0; i < this.length; i++) { ?????????for (var j = 0; j <= i; j++) { ?????????????if (this[i] > this[j]) { ?????????????????oValue = this[i]; ?????????????????this[i] = this[j]; ?????????????????this[j] = oValue; ?????????????} ?????????} ?????} ?????return this; ?}; ???// 获得数字数组中最大项 ?Array.prototype.GetMax = function() { ?????var oValue = 0; ?????for (var i = 0; i < this.length; i++) { ?????????if (this[i] > oValue) { ?????????????oValue = this[i]; ?????????} ?????} ?????return oValue; ?}; ???// 获得数字数组中最小项 ?Array.prototype.GetMin = function() { ?????var oValue = 0; ?????for (var i = 0; i < this.length; i++) { ?????????if (this[i] < oValue) { ?????????????oValue = this[i]; ?????????} ?????} ?????return oValue; ?}; ???// 获取当前时间的中文形式 ?Date.prototype.GetCNDate = function() { ?????var oDateText = ‘‘; ?????oDateText += this.getFullYear().LenWithZero(4) + new Number(24180).ChrW(); ?????oDateText += this.getMonth().LenWithZero(2) + new Number(26376).ChrW(); ?????oDateText += this.getDate().LenWithZero(2) + new Number(26085).ChrW(); ?????oDateText += this.getHours().LenWithZero(2) + new Number(26102).ChrW(); ?????oDateText += this.getMinutes().LenWithZero(2) + new Number(20998).ChrW(); ?????oDateText += this.getSeconds().LenWithZero(2) + new Number(31186).ChrW(); ?????oDateText += new Number(32).ChrW() + new Number(32).ChrW() + new Number(26143).ChrW() + new Number(26399).ChrW() + new String(‘26085199682010819977222352011620845‘).substr(this.getDay() * 5, 5).ToInt().ChrW(); ?????return oDateText; ?}; ?//扩展Date格式化 ?Date.prototype.Format = function(format) { ?????var o = { ?????????"M+": this.getMonth() + 1, //月份 ??????????????????"d+": this.getDate(), //日 ??????????????????"h+": this.getHours() % 12 == 0 ? 12 : this.getHours() % 12, //小时 ??????????????????"H+": this.getHours(), //小时 ??????????????????"m+": this.getMinutes(), //分 ??????????????????"s+": this.getSeconds(), //秒 ??????????????????"q+": Math.floor((this.getMonth() + 3) / 3), //季度 ??????????????????"S": this.getMilliseconds() //毫秒 ??????????????}; ?????var week = { ?????????"0": "\u65e5", ?????????"1": "\u4e00", ?????????"2": "\u4e8c", ?????????"3": "\u4e09", ?????????"4": "\u56db", ?????????"5": "\u4e94", ?????????"6": "\u516d" ?????}; ?????if (/(y+)/.test(format)) { ?????????format = format.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length)); ?????} ?????if (/(E+)/.test(format)) { ?????????format = format.replace(RegExp.$1, ((RegExp.$1.length > 1) ? (RegExp.$1.length > 2 ? "\u661f\u671f" : "\u5468") : "") + week[this.getDay() + ""]); ?????} ?????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; ?} ?Date.prototype.Diff = function(interval, objDate) { ?????//若参数不足或 objDate 不是日期类型則回传 undefined ?????if (arguments.length < 2 || objDate.constructor != Date) { return undefined; } ?????switch (interval) { ?????????//计算秒差 ?????????????????????????????????????????????????????????????????case ‘s‘: return parseInt((objDate - this) / 1000); ?????????????//计算分差 ?????????case ‘n‘: return parseInt((objDate - this) / 60000); ?????????????//计算時差 ?????????case ‘h‘: return parseInt((objDate - this) / 3600000); ?????????????//计算日差 ?????????case ‘d‘: return parseInt((objDate - this) / 86400000); ?????????????//计算周差 ?????????case ‘w‘: return parseInt((objDate - this) / (86400000 * 7)); ?????????????//计算月差 ?????????case ‘m‘: return (objDate.getMonth() + 1) + ((objDate.getFullYear() - this.getFullYear()) * 12) - (this.getMonth() + 1); ?????????????//计算年差 ?????????case ‘y‘: return objDate.getFullYear() - this.getFullYear(); ?????????????//输入有误 ?????????default: return undefined; ?????} ?}; ???//检测是否为空 ?Object.prototype.IsNullOrEmpty = function() { ?????var obj = this; ?????var flag = false; ?????if (obj == null || obj == undefined || typeof (obj) == ‘undefined‘ || obj == ‘‘) { ?????????flag = true; ?????} else if (typeof (obj) == ‘string‘) { ?????????obj = obj.trim(); ?????????if (obj == ‘‘) {//为空 ?????????????flag = true; ?????????} else {//不为空 ?????????????obj = obj.toUpperCase(); ?????????????if (obj == ‘NULL‘ || obj == ‘UNDEFINED‘ || obj == ‘{}‘) { ?????????????????flag = true; ?????????????} ?????????} ?????} ?????else { ?????????flag = false; ?????} ?????return flag;
js扩展
原文地址：https://www.cnblogs.com/fm060/p/10029470.html