<!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>
#box {
background: blue
}
#boxs {
background: red
}
#boxs div {
border: 1px solid black;
width: 100px;
height: 100px;
background: gray
}
</style>
</head>
<body>
<div id="box">
<div id="boxs">
<div></div>
<div></div>
<div></div>
</div>
</div>
<button id="button">删除 </button>
</body>
<script>
var f = document.getElementById("box");
var childs = f.childNodes;
console.log(length)
var b = document.getElementById("button");
b.onclick = function() {
for (var i = childs.length - 1; i >= 0; i--) {
f.removeChild(childs[i]);
}
}
</script>
</html>
