目标：
开发一个网页选项卡
效果暂时如下：
1743172283072.png
代码展示如下：
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>选项卡效果</title>
<style>
*{margin: 0; padding: 0; box-sizing: border-box;}
html, body{height: 100%;width: 100%;}
html{font-size: 10px;}
.tab{
width:40rem;
height:30rem;
border:solid 1px #000;
}
.tab-title{
width:100%;
height:5rem;
background-color:antiquewhite;
border-bottom: solid 2px orange;
display:flex;
justify-content: space-between;
align-items: center;
}
.tt{
flex: 1;
height:5rem;
background-color: #fff;
font-size: 1.8rem;
text-align:center;
line-height: 5rem;
}
.tt.active,
.tt:hover{
background-color: orange;
color:white;
}
.tab-content{
width: 100%;
height:calc(100% - 5rem); /* calculation 计算*/
background-color:aquamarine;
position: relative;
}
.tc{
width:100%;
height: 100%;
font-size: 1.8rem;
text-align:center;
color:white;
position: absolute;
display:none;
}
.tc.active{
display:block;
}
/* :nth-of-type(1) 伪类样式，和前面选择器中间不能有空格，表示选择第一个标签*/
.tc:nth-of-type(1) {
background-color:blue;
}
.tc:nth-of-type(2) {
background-color:green;
}
.tc:nth-of-type(3) {
background-color:red;
}
</style>
</head>
<body>
<div class="tab">
<div class="tab-title">
<div class="tt active">标题1</div>
<div class="tt">标题2</div>
<div class="tt">标题3</div>
</div>
<div class="tab-content">
<div class="tc active">内容部分1</div>
<div class="tc">内容部分2</div>
<div class="tc">内容部分3</div>
</div>
</div>
<script>
let tts = document.getElementsByClassName("tt")
for (let i = 0; i < tts.length; i++) {
tts[i].onmouseenter = function() {
for (let j = 0; j < tts.length; j++) {
tts[j].classList = "tt"
}
tts[i].classList = "tt active"
let tcs = document.getElementsByClassName("tc")
for(let x = 0; x < tcs.length; x ++) {
tcs[x].classList = "tc"
} tcs[i].classList = "tc active"
}
}
</script>
</body>
</html>
