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-u9fa5uf900-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-u9fa5uf900-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 ? "u661fu671f" : "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;