<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
div {
/* float:left; */
display: inline-block;
width: 50px;
height: 50px;
margin: 10px;
background-color: red;
}
</style>
</head>
<body>
<p><input type="button" value='生成10个div' id='but'></p>
<script>
let istrue = false; //拦截只执行一次
let oBut = document.getElementById('but');
oBut.onclick = function () {
if (istrue) {
return //拦截只执行一次
}
let frag = document.createDocumentFragment()//文档片段，用于加到页面上
for (let i = 0; i < 10; i++) {
let dom = document.createElement('div') //创建标签
frag.appendChild(dom)
}
document.body.appendChild(frag)
istrue = true;
}
</script>
</body>
</html>
