// 日期改變
          dateChange1:function(date){
            // console.log(date)
              if(this.mark==0){
                  let date1 = new Date(date[0])
                  let date2 = new Date(date[1])
                  this.current_begin_time = date1.getTime() / 1000;
                  this.current_end_time = date2.getTime() / 1000;
              }else if(this.mark==1){
                  this.current_end_time='';
                  this.current_begin_time='';
              }
 

var date = new Date('xxxx-xx-xx xx:xx:xx:xx');

    // 有三種方式獲取

    var time1 = date.getTime();

    var time2 = date.valueOf();

    var time3 = Date.parse(date);

    console.log(time1);

    console.log(time2);

    console.log(time3);

　　第一、第二種：會精確到毫秒　　以上三種獲取方式的區別：

　　第三種：只能精確到秒，毫秒用000替代