<!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>to do list</title>
<style>
* {
margin: 0;
padding: 0;
}
body {
padding: 100px;
}
textarea {
width: 200px;
height: 100px;
border: 1px solid pink;
outline: none;
resize: none;
}
ul {
margin-top: 50px;
}
li {
width: 300px;
padding: 5px;
background-color: rgb(245, 209, 243);
color: red;
font-size: 14px;
margin: 15px 0;
}
</style>
</head>
<body>
<textarea name="" id=""></textarea>
<button>按钮</button>
<ul>
</ul>
<script>
var btn = document.querySelector('button');
var text = document.querySelector('textarea');
var ul = document.querySelector('ul');
//给btn添加点击事件
btn.onclick = function () {
if (text.value == '') {
alert('请输入内容');
return false;
} else {
//1 创建元素
var li = document.createElement('li');
//2 把用户输入的内容 赋值给 li
li.innerHTML = text.value;
//3 添加入元素
ul.insertBefore(li,ul.children[0]);
}
}
//给text的添加焦点事件
text.onfocus = function () {
text.value = '';
}
</script>
</body>
</html>
