JS常用扩展

// 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;