js中async函数结合promise的小案例浅析
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2022-03-23 12:56:31
<!doctype html>
<html lang="en">
<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>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 class="box"></div>
<div class="box"></div>
<div class="box"></div>
<div class="box"></div>
<button id="btn">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>