一、事件类型
二、焦点事件
<body>
<input type="text">
<script>
const input = document.querySelector('input')
input.addEventListener('focus',function(){
console.log('有焦点触发')
})
input.addEventListener('blur',function(){
console.log('失去焦点触发')
})
</script>
</body>小米搜索框
需求：当表单得到焦点，显示下拉菜单，失去焦点隐藏下拉菜单
<!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;
box-sizing: border-box;
}
ul {
list-style: none;
}
.mi {
position: relative;
width: 223px;
margin: 100px auto;
}
.mi input {
width: 223px;
height: 48px;
padding: 0 10px;
font-size: 14px;
line-height: 48px;
border: 1px solid #e0e0e0;
outline: none;
}
.mi .search {
border: 1px solid #ff6700;
}
.result-list {
display: none;
position: absolute;
left: 0;
top: 48px;
width: 223px;
border: 1px solid #ff6700;
border-top: 0;
background: #fff;
}
.result-list a {
display: block;
padding: 6px 15px;
font-size: 12px;
color: #424242;
text-decoration: none;
}
.result-list a:hover {
background-color: #eee;
}
</style>
</head>
<body>
<div class="mi">
<input type="search" placeholder="小米笔记本">
<ul class="result-list">
<li><a href="#">全部商品</a></li>
<li><a href="#">小米11</a></li>
<li><a href="#">小米10S</a></li>
<li><a href="#">小米笔记本</a></li>
<li><a href="#">小米手机</a></li>
<li><a href="#">黑鲨4</a></li>
<li><a href="#">空调</a></li>
</ul>
</div>
<script>
// 1. 获取元素
const input = document.querySelector('[type=search]')
const ul = document.querySelector('.result-list')
// console.log(input);
// 2. 监听事件 获得焦点
input.addEventListener('focus',function(){
// ul 显示
ul.style.display = 'block'
// 添加一个带有颜色边框的类名
input.classList.add('search')
})
// 3. 监听事件 失去焦点
input.addEventListener('blur',function(){
ul.style.display = 'none'
input.classList.add('search')
})
</script>
</body>
</html>
