近期遇到需要根据屏幕宽度展示不同数量item，且需要收缩展开功能，记录一下
<!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">
<script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js"></script>
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
li {
list-style: none;
}
.wrap {
width: 40vw;
height: 40vh;
display: grid;
grid-template-columns: repeat(3, 1fr);
grid-template-rows: repeat(3, 1fr);
}
@media screen and (max-width: 800px) {
.wrap .item:nth-of-type(n + 1) {
display: none;
}
}
@media screen and (max-width: 1500px) {
.wrap .item:nth-of-type(n + 2) {
display: none;
}
}
@media screen and (max-width: 1800px) {
.wrap .item:nth-of-type(n + 3) {
display: none;
}
}
.box .item {
display: block!important;
}
.show {
width: 100px;
height: 50px;
}
</style>
</head>
<body>
<ul class="wrap">
<li class="item">1</li>
<li class="item">2</li>
<li class="item">3</li>
<li class="item">4</li>
<li class="item">5</li>
<li class="item">6</li>
<li class="item">7</li>
<li class="item">8</li>
<li class="item">9</li>
</ul>
<button class="show">显示更多</button>
</body>
<script>
$('.show').click(()=> {
if (!$('.wrap').hasClass('box')) {
$('.wrap').addClass('box')
} else {
$('.wrap').removeClass('box')
}
})
</script>
</html>
