js实现类似C# 时间格式化、时间运算

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/** * js时间对象的格式化;* eg:format="yyyy-MM-dd hh:mm:ss";  */Date.prototype.format = function (format) {    var o = {        "M+": this.getMonth() + 1,  //month         "d+": this.getDate(),     //day         "h+": this.getHours(),    //hour         "m+": this.getMinutes(),  //minute         "s+": this.getSeconds(), //second         "q+": Math.floor((this.getMonth() + 3) / 3),  //quarter         "S": this.getMilliseconds() //millisecond     }    if (/(y+)/.test(format)) {        format = format.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));    }    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;}/***js中更改日期 * y年, m月, d日, h小时, n分钟,s秒 */Date.prototype.add = function (part, value) {    value *= 1;    if (isNaN(value)) {        value = 0;    }    switch (part) {        case "y":            this.setFullYear(this.getFullYear() + value);            break;        case "m":            this.setMonth(this.getMonth() + value);            break;        case "d":            this.setDate(this.getDate() + value);            break;        case "h":            this.setHours(this.getHours() + value);            break;        case "n":            this.setMinutes(this.getMinutes() + value);            break;        case "s":            this.setSeconds(this.getSeconds() + value);            break;        default:    }}

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