![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
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Teacher's comments：
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<!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>ToList练习</title>
</head>
<body>
<h3>留言板</h3>
<input type="text">
<ul></ul>
<script>
var comment=document.querySelector('input');
var ul=document.getElementsByTagName('ul')[0];
comment.focus();
// event 代表事件对象
comment.onkeydown=function(event) {
if (event.keyCode===13) {
var li=document.createElement('li');
li.innerHTML=comment.value+'<a href="javascrip:;" onclick="del(this)">删除</a>';
if(ul.childElementCount===0){
ul.appendChild(li);
} else {
var first=ul.firstElementChild;
ul.insertBefore(li,first);
}
comment.value ='';
}
}
function del(ele){
if(confirm('要删除吗')) {
ele.parentNode;
var li=ele.parentNode;
li.parentNode.removeChild(li);
}
}
</script>
</body>
</html>点击 "运行实例" 按钮查看在线实例