/** 系统中JS的扩展函数***/// 清除两边的空格String.prototype.trim = function() { ???return this.replace(/(^\s*)|(\s*$)/g, ‘‘);};// 合并多个空白为一个空白String.prototype.ResetBlank = function() { ???var regEx = /\s+/g; ???return this.replace(regEx, ‘ ‘);};// 保留数字String.prototype.GetNum = function() { ???var regEx = /[^\d]/g; ???return this.replace(regEx, ‘‘);};// 保留中文String.prototype.GetCN = function() { ???var regEx = /[^\u4e00-\u9fa5\uf900-\ufa2d]/g; ???return this.replace(regEx, ‘‘);};// String转化为NumberString.prototype.ToInt = function() { ???return isNaN(parseInt(this)) ? this.toString() : parseInt(this);};// 得到字节长度String.prototype.GetLen = function() { ???var regEx = /^[\u4e00-\u9fa5\uf900-\ufa2d]+$/; ???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‘);};/******add By 刘景宁 2010-12-09 *******/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通用扩展方法——转自翘首以望
原文地址：https://www.cnblogs.com/Life-is-Demo/p/9113711.html