JS将字符串yyyyMMddHHmmss转Date

var dateString1 = "20190328112125";
var pattern = /(\d{4})(\d{2})(\d{2})(\d{2})(\d{2})(\d{2})/;
var formatedDate1 = dateString1.replace(pattern, '$1/$2/$3 $4:$5:$6');
var ddate1 = new Date(formatedDate1);