简单导航栏
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>导航栏</title>
</head>
<style>
.navigation{
position: relative;
left:0;
top:0;
width:100px;
height:600px;
border:1px solid #000;
}
.navigation .title{
float:left;
width:100%;
/height:150px;/
height: 30px;
border-bottom:1px solid #000;
text-align: center;
line-height: 30px;
overflow: hidden;
cursor: pointer;
background: #f1f1f1;
transition:height 0.5s;
}
.navigation .title span{
float:left;
width:100%;
height:30px;
border-bottom:1px solid #000;
text-align: center;
font-size: 20px;
line-height: 30px;
}
.navigation .title .chile-child{
float:left;
width:100%;
height:30px;
text-align: center;
font-size: 15px;
line-height: 30px;
}
.active{
background: #4CAF50;
}
</style>
<body>
<div class="navigation">
<div class="title">
<span class="active">首页</span>
</div>
<div class="title">
<span>视频</span>
<div class="chile-child">喜剧</div>
<div class="chile-child">恐怖悬疑</div>
<div class="chile-child">功夫</div>
<div class="chile-child">科幻</div>
</div>
<div class="title">
<span>音乐</span>
<div class="chile-child">流行</div>
<div class="chile-child">摇滚</div>
<div class="chile-child">电子</div>
<div class="chile-child">轻音乐</div>
</div>
<div class="title">
<span>小说</span>
<div class="chile-child">恐怖</div>
<div class="chile-child">玄幻</div>
<div class="chile-child">言情</div>
<div class="chile-child">都市</div>
</div>
</div>
</body>
<script>
let titles=document.querySelectorAll(".title span");
let links=document.querySelectorAll(".chile-child");
let boxs=[];
for(let i=0;i<titles.length;i++){
let obj={
'is_choose':false
}
boxs.push(obj);
}
for(let i=0;i<titles.length;i++){
titles[i].addEventListener("click",function(){
for(let j=0;j<titles.length;j++){
if(j===i){
titles[j].setAttribute('class','active');
}else{
titles[j].setAttribute('class','')
}
}
if(!boxs[i].is_choose){
this.parentNode.style.height=150+'px';
}else{
this.parentNode.style.height=30+'px';
}
boxs[i].is_choose=!boxs[i].is_choose;
})
}
for(let i=0;i<links.length;i++){
links[i].addEventListener('click',function(){
console.log(this);
})
}
</script>
</html>
image.png
