// 获取时间差
getTimeDifference(createTime){
// let createTime ="1584861145000";//创建时间
let currentTime =new Date().getTime();//
let timeDifference = currentTime - createTime;
var days=Math.floor(timeDifference/(24*3600*1000));
//计算出小时数
let leave1=timeDifference%(24*3600*1000) //计算天数后剩余的毫秒数
let hours=Math.floor(leave1/(3600*1000));
//计算相差分钟数
let leave2=leave1%(3600*1000); //计算小时数后剩余的毫秒数
let minutes=Math.floor(leave2/(60*1000));
//计算相差秒数
let leave3=leave2%(60*1000); //计算分钟数后剩余的毫秒数
let seconds=Math.round(leave3/1000);
// let travel_time=" "+days+"天 "+hours+"小时"+minutes+"分钟";
return travel_time ;
},