<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <style> *{ margin: 0; padding: 0; list-style: none; } .box{ height: 15px; margin-top: 20px; transform: translateX(-100%); transition: all 1s linear; } button{ margin-top: 30px; } </style> </head> <body> <div></div> <div></div> <div></div> <div></div> <button>点击开始</button> <script> const box=document.querySelectorAll(".box") box.forEach((item,index)=>{ item.style.cssText=`width:${100+index*15}px;background:rgb(${Math.random()*255},${Math.random()*255},${Math.random()*255})` }) btn.onclick=async function(){ for(let i=0;i<box.length;i++){ await fn(box[i]) } } function fn(el){ return new Promise((resolve,reject)=>{ el.style.transform=`translateX(0)`; el.addEventListener("transitionend",function(){ resolve();//为什么调用这个成功函数 }) }) } </script> </body> </html>
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