Jq 转换日期对象 /Date(1620699801000)/ 为正常时间

https://blog.csdn.net/honeycandys/article/details/80679913

function changeDateFormat(val) {
        if (val != null) {
            var date = new Date(parseInt(val.replace("/Date(", "").replace(")/", ""), 10));
            //月份为0-11所以+1，月份小于10补个0
            var month = date.getMonth() + 1 < 10 ? "0" + (date.getMonth() + 1) : date.getMonth() + 1;
            var currentDate = date.getDate() < 10 ? "0" + date.getDate() : date.getDate();
            var hour = date.getHours() < 10 ? "0" + date.getHours() : date.getHours();
            var minute = date.getMinutes() < 10 ? "0" + date.getMinutes() : date.getMinutes();
            var second = date.getSeconds() < 10 ? "0" + date.getSeconds() : date.getSeconds();
            var dd = date.getFullYear() + "-" + month + "-" + currentDate + " " + hour + ":" + minute + ":" + second;
            return dd;
        }
    }
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原文链接：https://blog.csdn.net/honeycandys/article/details/80679913

function dateToStr(dateTime, fmt) {
                        if (dateTime != null && dateTime != "" && dateTime != undefined) {
                            var datetime = new Date(parseInt(dateTime.replace("/Date(", "").replace(")/", ""), 10));
                            if (parseInt(datetime) == datetime) {
                                if (datetime.length == 10) {
                                    datetime = parseInt(datetime) * 1000;
                                } else if (datetime.length == 13) {
                                    datetime = parseInt(datetime);
                                }
                            }
                            datetime = new Date(datetime);
                            var o = {
                                "M+": datetime.getMonth() + 1,                 //月份   
                                "d+": datetime.getDate(),                    //日   
                                "h+": datetime.getHours(),                   //小时   
                                "m+": datetime.getMinutes(),                 //分   
                                "s+": datetime.getSeconds(),                 //秒   
                                "q+": Math.floor((datetime.getMonth() + 3) / 3), //季度   
                                "S": datetime.getMilliseconds()             //毫秒   
                            };
                            if (/(y+)/.test(fmt))
                                fmt = fmt.replace(RegExp.$1, (datetime.getFullYear() + "").substr(4 - RegExp.$1.length));
                            for (var k in o)
                                if (new RegExp("(" + k + ")").test(fmt))
                                    fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
                            return fmt;
                        }
                        return "";
                    }