Date.prototype.toString = function (format) {    if (format == null) {        format = "yyyy-MM-dd HH:mm:ss";    }    format = format.replace(/yyyy/g, this.getFullYear());    format = format.replace(/yyy/g, this.getYear());    format = format.replace(/yy/g, this.getFullYear().toString().slice(-2));    if (format.indexOf('mi') >= 0) {        format = format.replace(/mi/g, this.getMilliseconds().toString());    }    if (format.indexOf('M') >= 0) {        var M = (this.getMonth() + 1).toString();        format = format.replace(/MM/g, ("0" + M).slice(-2));        format = format.replace(/M/g, M);    }    if (format.indexOf('ddd') >= 0) {        var xq = ["星期一", "星期二", "星期三", "星期四", "星期五", "星期六", "星期日"];        format = format.replace(/ddd/g, xq[this.getDay()]);    }    if (format.indexOf('d') >= 0) {        var d = this.getDate().toString();        format = format.replace(/dd/g, ("0" + d).slice(-2));        format = format.replace(/d/g, d);    }    if (format.indexOf('h') >= 0 || format.indexOf('H') >= 0) {        var h = this.getHours();        format = format.replace(/HH/g, ("0" + h.toString()).slice(-2));        format = format.replace(/H/g, h);        h = h % 12;        format = format.replace(/hh/g, ("0" + h.toString()).slice(-2));        format = format.replace(/h/g, h);    }    if (format.indexOf('m') >= 0) {        var m = this.getMinutes().toString();        format = format.replace(/mm/g, ("0" + m).slice(-2));        format = format.replace(/m/g, m);    }    if (format.indexOf('s') >= 0) {        var s = this.getSeconds().toString();        format = format.replace(/ss/g, ("0" + s).slice(-2));        format = format.replace(/s/g, m);    }    return format;}

效果

代码段