function GetDateTime() {

        var getDate = new Date;

        let dateYear = getDate.getFullYear();             //获取年 

        let dateMonth = getDate.getMonth() + 1;               //获取月  

        let dateDate = getDate.getDate();                 //获取当日

        let dateHours = getDate.getHours();               //获取小时

        let dateMinutes = getDate.getMinutes();           //获取分钟

        let dateSeconds = getDate.getSeconds();           //获取秒

        dateMonth = dateMonth < 10 ? "0" + dateMonth : dateMonth;

        dateDate = dateDate < 10 ? "0" + dateDate : dateDate;

        dateHours = dateHours < 10 ? "0" + dateHours : dateHours;

        dateMinutes = dateMinutes < 10 ? "0" + dateMinutes : dateMinutes;

        dateSeconds = dateSeconds < 10 ? "0" + dateSeconds : dateSeconds;

        return dateYear + "-" + dateMonth + "-" + dateDate + " " + dateHours + ":" + dateMinutes + ":" + dateSeconds;

    }

返回你需要的字符串模式，在js中调用此方法即可，月份要进行加一，获取到的月份会比当前月份小一个月，下面的【三目】是为了让返回的字符串更加标准化，无硬性要求可去除。