解决LayUI中的JSON返回DateTime的"/Date(1589340963000)/"格式的问题

Date.prototype.format = function (format) //author: meizz
    {
        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;
    }
    function formatTime(val) {
        var re = /-?\d+/;
        var m = re.exec(val);
        var d = new Date(parseInt(m[0]));
        // 按【2012-02-13 09:09:09】的格式返回日期
        return d.format("yyyy-MM-dd hh:mm:ss");
    }
    function formatDate(val) {
        var re = /-?\d+/;
        var m = re.exec(val);
        var d = new Date(parseInt(m[0]));
        // 按【2012-02-13】的格式返回日期
        return d.format("yyyy-MM-dd");
    }