js 时间格式化

// 时间格式化Date.prototype.format = function(format) {    /*     * eg:format="yyyy-MM-dd hh:mm:ss";     */    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;}

val_date.format("yyyy-MM-dd hh:mm").toString();