一个格式化日期和时间的javaScript类库

　　原文地址：http://www.cnblogs.com/zhangpengshou/archive/2012/07/19/2599053.html

　　结合meizz的代码做了适当调整。

Date.PRototype.Format = function (fmt) {    var that = this;    var postfix = false;    var o = {        "M+": this.getMonth() + 1, //month        "d+": this.getDate(), //day        "h+": function () {            return postfix ? (that.getHours() % 12 == 0 ? 12 : that.getHours() % 12) : that.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(fmt)) fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));    for (var k in o) {        if (new RegExp("(" + k + ")").test(fmt)) {            if (RegExp.$1.length == 1 && RegExp.$1 == "h") postfix = true;            var val = typeof (o[k]) == "function" ? o[k].apply(this) : o[k];            fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (val) : (("00" + val).substr(("" + val).length)));                    }    }    return fmt + (postfix ? ((this.getHours() < 12) ? " AM" : " PM") : "");}// following are testing codevar Ld = "26-09-2014";var Lt = "13:15:23";var arrDateParts = Ld.split("-");if (arrDateParts.length == 3) {    var dayNum = arrDateParts[0];    var monthNum = arrDateParts[1];    var yearNum = arrDateParts[2];    var D = new Date(monthNum.concat("/", dayNum, "/", yearNum, ' ', Lt));    console.info(D.Format("M/dd/yyyy h:mm:ss"));}

　　以上代码可根据所提供的格式字符串以及时间来判断是否需要添加AM/PM后缀。