string对象
1.去除空格:trim
//String.prototype.trim = function () {//js1.8版本以上自带,这里强烈建议不重复构写方法,原因会超多次走这个方法 // return this.replace(/(^\s*)|(\s*$)/g, ''); //} String.prototype.trimLeft = function () { return this.replace(/(^\s*)/g, ''); } String.prototype.trimRight = function () { return this.replace(/(\s*$)/g, ''); }
String.prototype.contains = function (str) {//利用indexof //值为位置,为-1说明不包含 if (this.indexOf(str) >= 0) return true; else return false; }; String.prototype.contains = function (str) {//利用正则表达式 var reg = new RegExp(str); return reg.test(this); };Array对象
1.是否包含某元素
JQuery已有 $.inArray(str, arr); 来判断
如果非要写扩展方法
下面是常用扩展方法集合
Array.prototype.contains = function(item){ for(i=0;i<this.length;i++){ if(this[i]==item){return true;} } return false; };
下面是常用扩展方法集合
<script type="text/javascript"> //获取字符数组 String.prototype.toCharArray = function () { return this.split(""); } //获取N个相同的字符串 String.prototype.repeat = function (num) { var tmpArr = []; for (var i = 0; i < num; i++) { temArr.push(this); return temArr.join(""); } } //逆序 String.prototype.reverse = function () { return this.split("").reverse().join(""); } //测试是否是数字 String.prototype.isNumeric = function () { var tmpFloat = parseFloat(this); if (isNaN(tmpFloat)) return false; var tmpLen = this.length - tmpFloat.toString().length; return tmpFloat + "0".Repeat(tmpLen) == this; } //测试是否是整数 String.prototype.isInt = function () { if (this == "NaN") return false; return this == parseInt(this).toString(); } // 合并多个空白为一个空白 String.prototype.resetBlank = function () { return this.replace(/s+/g, " "); } // 除去左边空白 String.prototype.LTrim = function () { return this.replace(/^s+/g, ""); } // 除去右边空白 String.prototype.RTrim = function () { return this.replace(/s+$/g, ""); } // 除去两边空白 String.prototype.trim = function () { return this.replace(/(^s+)|(s+$)/g, ""); } // 保留数字 String.prototype.getNum = function () { return this.replace(/[^d]/g, ""); } // 保留字母 String.prototype.getEn = function () { return this.replace(/[^A-Za-z]/g, ""); } // 保留中文 String.prototype.getCn = function () { return this.replace(/[^u4e00-u9fa5uf900-ufa2d]/g, ""); } // 得到字节长度 String.prototype.getRealLength = function () { return this.replace(/[^x00-xff]/g, "--").length; } // 从左截取指定长度的字串 String.prototype.left = function (n) { return this.slice(0, n); } // 从右截取指定长度的字串 String.prototype.right = function (n) { return this.slice(this.length - n); } // HTML编码 String.prototype.HTMLEncode = function () { var re = this; var q1 = [/x26/g, /x3C/g, /x3E/g, /x20/g]; var q2 = ["&", "<", ">", " "]; for (var i = 0; i < q1.length; i++) re = re.replace(q1[i], q2[i]); return re; } // Unicode转化 String.prototype.ascW = function () { var strText = ""; for (var i = 0; i < this.length; i++) strText += "&#" + this.charCodeAt(i) + ";"; return strText; } // 获取文件全名 String.prototype.GetFileName = function () { var regEx = /^.*\/([^\/\?]*).*$/; 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 String.prototype.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; }; Array.prototype.add = function (item) { this.push(item); } Array.prototype.addRange = function (items) { var length = items.length; if (length != 0) { for (var index = 0; index < length; index++) { this.push(items[index]); } } } Array.prototype.clear = function () { if (this.length > 0) { this.splice(0, this.length); } } Array.prototype.isEmpty = function () { if (this.length == 0) { return true; } else { return false; } } Array.prototype.clone = function () { var clonedArray = []; var length = this.length; for (var index = 0; index < length; index++) { clonedArray[index] = this[index]; } return clonedArray; } Array.prototype.contains = function (item) { var index = this.indexOf(item); return (index >= 0); } Array.prototype.dequeue = function () { return this.shift(); } Array.prototype.indexOf = function (item) { var length = this.length; if (length != 0) { for (var index = 0; index < length; index++) { if (this[index] == item) { return index; } } } return -1; } Array.prototype.insert = function (index, item) { this.splice(index, 0, item); } Array.prototype.joinstr = function (str) { var newStr = new Array(this.length); for (var i = 0; i < this.length; i++) { newStr[i] = this[i] + str; } return newStr; } Array.prototype.queue = function (item) {//入队 this.push(item); } Array.prototype.remove = function (item) { var index = this.indexOf(item); if (index >= 0) { this.splice(index, 1); } } Array.prototype.removeAt = function (index) { this.splice(index, 1); } //给js原生Array增加each方法 Array.prototype.each = function (fn) { return this.length ? [fn(this.slice(0, 1))].concat(this.slice(1).each(fn)) : []; }; // 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; } </script>