1.sleep函数
sleep函数作用是让线程休眠，等到指定时间在重新唤起。
2、sleep实现
<!DOCTYPE html><html lang="zh"> ???<head> ???????<meta charset="UTF-8" /> ???????<meta name="viewport" content="width=device-width, initial-scale=1.0" /> ???????<meta http-equiv="X-UA-Compatible" content="ie=edge" /> ???????<title>js sleep函数</title> ???</head> ???<body> ???????<script type="text/javascript"> ???????????//方法一 ???????????function sleep1(ms, callback) { ???????????????setTimeout(callback, ms) ???????????} ???????????//sleep 1s ???????????sleep1(1000, () => { ???????????????console.log(1000) ???????????}) ???????????//方法二 ???????????function sleep2(ms) { ???????????????return new Promise(function(resolve, reject) { ???????????????????setTimeout(resolve, ms) ???????????????}) ???????????} ???????????sleep2(1000).then(() => { ???????????????console.log(2000) ???????????}) ???????????//方法三 ???????????function sleep3(ms) { ???????????????return new Promise(function(resolve, reject) { ???????????????????setTimeout(resolve, ms) ???????????????}) ???????????} ???????????async function init() { ???????????????await sleep3(1000); ???????????} ???????????init().then(() => { ???????????????console.log(3000) ???????????}) ???????</script> ???</body></html>js 实现sleep函数
原文地址：https://www.cnblogs.com/mengfangui/p/9765243.html