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批改状态：合格
老师批语：写得不错, 没写总结, 下次注意
1. 实例演示如何消除子元素浮动造成父元素高度折叠的影响
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>消除子元素浮动</title>
<style>
.box1 {
width: 300px;
border: 5px dashed red;
overflow: hidden;
}
.box2 {
width: inherit;
height: 300px;
background-color: aquamarine;
float: left;
}
</style>
</head>
<body>
<div class="box1">
<div class="box2">
子元素
</div>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
2. 实例演示三列布局的实现原理( 绝对定位实现, 浮动定位实现)
绝对定位实现：
<!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">
<title>三列布局（绝对定位）</title>
<style>
.container {
width: 1000px;
margin: 0 auto;
}
.header,
.footer {
height: 60px;
background-color: lightgray;
}
.main {
background-color: lightblue;
margin: 5px auto;
position: relative;
}
.left {
width: 200px;
min-height: 800px;
background-color: lightgrey;
position: absolute;
left: 0;
top: 0;
}
.content {
min-height: 800px;
background-color: lightgreen;
margin-left: 200px;
margin-right: 200px;
}
.right {
width: 200px;
min-height: 800px;
background-color: lightgrey;
position: absolute;
top: 0;
right: 0;
}
</style>
</head>
<body>
<div class="container">
<div class="header">头部</div>
<div class="main">
<div class="left">左侧</div>
<div class="content">内容</div>
<div class="right">右侧</div>
</div>
<div class="footer">底部</div>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
浮动实现：
<!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">
<title>三列布局（浮动）</title>
<style>
.container {
width: 1000px;
margin: 0 auto;
}
.header,
.footer {
height: 60px;
background-color: lightgray;
}
.main {
background-color: lightblue;
margin: 5px auto;
overflow: hidden;
}
.left {
width: 200px;
min-height: 800px;
background-color: lightgrey;
float: left;
}
.content {
min-height: 800px;
background-color: lightgreen;
float: left;
width: 580px;
margin-left: 10px;
}
.right {
width: 200px;
min-height: 800px;
background-color: lightgrey;
float: right;
}
</style>
</head>
<body>
<div class="container">
<div class="header">头部</div>
<div class="main">
<div class="left">左侧</div>
<div class="content">内容</div>
<div class="right">右侧</div>
</div>
<div class="footer">底部</div>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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