JS擴(kuò)展方法實(shí)例分析

字號(hào):


    JS擴(kuò)展方法與C#的擴(kuò)展方法非常相似,也是可以鏈?zhǔn)秸{(diào)用的,也是通過對(duì)某個(gè)類的擴(kuò)展寫法來實(shí)現(xiàn)。這個(gè)東西非常好用,如果將預(yù)先寫好的方法放到一個(gè)js里面引用的話,那么后面寫js將非常有趣。
    下面給出一個(gè)例子:
    <head>
    <title>測(cè)試JS擴(kuò)展方法</title>
    <script type="text/javascript">
    // 合并多個(gè)空白為一個(gè)空白
    String.prototype.ResetBlank = function() { //對(duì)字符串?dāng)U展
    var regEx = /\s+/g;
    return this.replace(regEx, ' ');
    };
    window.onload = function()
    {
    var str = "你 在他想還好嗎?";
    alert(str);
    str = str.ResetBlank(); //這樣就能夠調(diào)用了,跟C#的很像吧!
    alert(str);
    }
    </script>
    </head>
    好像只是告訴自己有這樣一個(gè)東西而已;
    下面給出找到的一個(gè)非常不錯(cuò)的js擴(kuò)展:
    // 清除兩邊的空格
    String.prototype.trim = function() {
    return this.replace(/(^\s*)|(\s*$)/g, '');
    };
    // 合并多個(gè)空白為一個(gè)空白
    String.prototype.ResetBlank = function() {
    var regEx = /\s+/g;
    return this.replace(regEx, ' ');
    };
    // 保留數(shù)字
    String.prototype.GetNum = function() {
    var regEx = /[^\d]/g;
    return this.replace(regEx, '');
    };
    // 保留中文
    String.prototype.GetCN = function() {
    var regEx = /[^\u4e00-\u9fa5\uf900-\ufa2d]/g;
    return this.replace(regEx, '');
    };
    // String轉(zhuǎn)化為Number
    String.prototype.ToInt = function() {
    return isNaN(parseInt(this)) ? this.toString() : parseInt(this);
    };
    // 得到字節(jié)長度
    String.prototype.GetLen = function() {
    var regEx = /^[\u4e00-\u9fa5\uf900-\ufa2d]+$/;
    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;
    }
    };
    // 獲取文件全名
    String.prototype.GetFileName = function() {
    var regEx = /^.*\/([^\/\?]*).*$/;
    return this.replace(regEx, '$1');
    };
    // 獲取文件擴(kuò)展名
    String.prototype.GetExtensionName = function() {
    var regEx = /^.*\/[^\/]*(\.[^\.\?]*).*$/;
    return this.replace(regEx, '$1');
    };
    //替換所有
    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 劉景寧 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;
    };
    // 數(shù)字補(bǔ)零
    Number.prototype.LenWithZero = function(oCount) {
    var strText = this.toString();
    while (strText.length < oCount) {
    strText = '0' + strText;
    }
    return strText;
    };
    // Unicode還原
    Number.prototype.ChrW = function() {
    return String.fromCharCode(this);
    };
    // 數(shù)字?jǐn)?shù)組由小到大排序
    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;
    };
    // 數(shù)字?jǐn)?shù)組由大到小排序
    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;
    };
    // 獲得數(shù)字?jǐn)?shù)組中最大項(xiàng)
    Array.prototype.GetMax = function() {
    var oValue = 0;
    for (var i = 0; i < this.length; i++) {
    if (this[i] > oValue) {
    oValue = this[i];
    }
    }
    return oValue;
    };
    // 獲得數(shù)字?jǐn)?shù)組中最小項(xiàng)
    Array.prototype.GetMin = function() {
    var oValue = 0;
    for (var i = 0; i < this.length; i++) {
    if (this[i] < oValue) {
    oValue = this[i];
    }
    }
    return oValue;
    };
    // 獲取當(dāng)前時(shí)間的中文形式
    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;
    };
    //擴(kuò)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, //小時(shí)
    "H+": this.getHours(), //小時(shí)
    "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) {
    //若參數(shù)不足或 objDate 不是日期類型則回傳 undefined
    if (arguments.length < 2 || objDate.constructor != Date) { return undefined; }
    switch (interval) {
    //計(jì)算秒差
    case 's': return parseInt((objDate - this) / 1000);
    //計(jì)算分差
    case 'n': return parseInt((objDate - this) / 60000);
    //計(jì)算時(shí)差
    case 'h': return parseInt((objDate - this) / 3600000);
    //計(jì)算日差
    case 'd': return parseInt((objDate - this) / 86400000);
    //計(jì)算周差
    case 'w': return parseInt((objDate - this) / (86400000 * 7));
    //計(jì)算月差
    case 'm': return (objDate.getMonth() + 1) + ((objDate.getFullYear() - this.getFullYear()) * 12) - (this.getMonth() + 1);
    //計(jì)算年差
    case 'y': return objDate.getFullYear() - this.getFullYear();
    //輸入有誤
    default: return undefined;
    }
    };
    //檢測(cè)是否為空
    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 == '') {//為空
    flag = true;
    } else {//不為空
    obj = obj.toUpperCase();
    if (obj == 'NULL' || obj == 'UNDEFINED' || obj == '{}') {
    flag = true;
    }
    }
    }
    else {
    flag = false;
    }
    return flag;