This time I will bring you the efficient synchronization of js with the server time. What are the precautions for synchronizing the js with the server time efficiently? The following is a practical case, let’s take a look.
Option 1: Request time from the server every countdown
//开启定时器
var timer = setInterval(function () {
//执行请求，获取当前服务端时间并进行相应操作
}, 1000);status.
Option 2: Return a countdown based on server time from the server//开启定时器
//假设请求获取到一个时间戳时间差 dateDiff
var timer = setInterval(function () {
//每秒会获取本地时间，这样就算执行的周期不准确 也可以准确的获取时间差
var countDown = endTime - (+Date.now())/1000 + dateDiff;
// 倒计时页面渲染
}, 1000);life cycleHigh accuracy, even if the page is open for a long time, it will still maintain high accuracy
Disadvantages:
Js Canvas makes image compression
angularJS Ionic uploads images on the mobile side (with code )
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