js日期格式化 兼容ie

<script type="text/javascript">
      function dateFormat(dt, formater) { //author: meizz
        if (dt) {
          var date;
          var arrDate = new Array();
          var arrTime = new Array();
          if ((typeof dt) == 'string') {
            if (dt.indexOf('T') != -1) {
              dt = dt.replace(/T/g, ' ');
            }
            var item = dt.split(' ');
            if (dt.indexOf('-') != -1) {
              arrDate = item[0].split('-');
              arrTime = item[1].split(':');
            } else if (dt.indexOf('/') != -1) {
              arrDate = item[0].split('/');
              arrTime = item[1].split(':');
            }
            
            if (arrDate && arrTime) {
              date = new Date(
                parseInt(arrDate[0]),
                parseInt(arrDate[1]),
                parseInt(arrDate[2]),
                parseInt(arrTime[0]),
                parseInt(arrTime[1]),
                parseInt(arrTime[2])
              );
            }
          } else {
            date = new Date(dt)
          }
          
          var o = {
            "M+": date.getMonth() + 1, //月份
            "d+": date.getDate(), //日
            "h+": date.getHours(), //小时
            "m+": date.getMinutes(), //分
            "s+": date.getSeconds(), //秒
            "q+": Math.floor((date.getMonth() + 3) / 3), //季度
            "S": date.getMilliseconds() //毫秒
          };
          if (/(y+)/.test(formater))
            formater = formater.replace(RegExp.$1, (date.getFullYear() + "").substr(4 - RegExp.$1.length));
          for (var k in o)
            if (new RegExp("(" + k + ")").test(formater))
              formater = formater.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[
                k]).length)));
          return formater;
        }
        return "";
      }


      console.log(dateFormat('2020-07-17 09:10:52', 'yyyy-MM-dd hh:mm:ss'))
      console.log(dateFormat('2020-06-01 18:34:39:000000', 'yyyy-MM-dd hh:mm:ss'))
      console.log(dateFormat('2020-07-17T18:02:38.767+0800', 'yyyy-MM-dd hh:mm:ss'))
      console.log(dateFormat(1594999335541, 'yyyy-MM-dd hh:mm:ss'))
</script>