传入指定时间戳开始倒计时

概述var vm = new Vue({ el:‘#app‘, data: { time : new Date().getTime() + 24 * 60 * 60 * 1000, timer : null, countTimeObj: {}, endTime : null }, mounted () {

var vm = new Vue({    el:‘#app‘,data: {      time : new Date().getTime() + 24 * 60 * 60 * 1000,timer : null,countTimeObj: {},endTime : null    },mounted () {      var that = this      that.countTime()    },methods : {      // 倒计时      countTime () {        var that = this;        var start = new Date().getTime();        function num (n) {          return n < 10 ? (‘0‘+ n ) : n;        }        // 差值        var leftTime = parseInt((that.time) - start);        var h = (parseInt(leftTime / (60*60*1000) % 24));        var m = (parseInt(leftTime / (60*1000) % 60));        var s = (parseInt(leftTime / 1000 % 60));        that.countTimeObj  = {          h:num(h),m:num(m),s:num(s)        };        that.endTime = that.countTimeObj.h + ‘ : ‘ + that.countTimeObj.m + ‘ : ‘ + that.countTimeObj.s        // console.log(that.endTime)        // 时间差为0        if (leftTime < 0) {          that.countTimeObj = {            h:"00",m:"00",s:"00"          };          clearTimeout(that.timer);        } else {          that.timer = setTimeout(that.countTime,1000);        }      }    }  })

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