时间：2021-07-01 10:21:17 帮助过：13人阅读
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<style type="text/css">
*{
padding: 0;
margin: 0;
}
ul,li{
list-style: none;
}
#warp{
width: 600px;
height: auto;
margin: 0 auto;
margin-top: 20px;
}
#warp .content p{
width: 300px;
height: 30px;
background-color: #000;
color: #fff;
line-height: 30px;
text-align: center;
}
#warp .content+ .content{
margin-top: 2px;
}
#warp .content ul{
display: none;
}
#warp .content ul.on{
display: block;
}
#warp .content li{
background-color: #ccc;
width: 300px;
text-align: center;
}
#warp .content li + li{
margin-top: 1px;
}
</style>
<body>
<p id="warp">
<p class="content">
<p>动物</p>
<ul>
<li>猴子</li>
<li>大象</li>
<li>狮子</li>
</ul>
</p>
<p class="content">
<p>山川</p>
<ul>
<li>长江</li>
<li>黄河</li>
<li>井水</li>
</ul>
</p>
<p class="content">
<p>美女</p>
<ul>
<li>貂蝉</li>
<li>西施</li>
<li>秀秀</li>
</ul>
</p>
</p>
<script>
let oP = document.getElementsByTagName("p"),
aUl = document.getElementsByTagName("ul"),
index;
console.log(oP.length);
for(var i=0;i<oP.length;i++){
oP[i].index = i;
oP[i].onclick = function(){
index = this.index;
aUl[index].className = aUl[index].className === ""? "on" : "";
console.log(i)
}
}
</script>
</body>
</html>效果图：
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