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批改状态：合格
老师批语：写得不错, 就是忘了写总结了
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">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
.box1 {
width: 150px;
border: 5px solid rgb(40, 9, 211);
overflow: hidden;
/* 主要用来清浮动，消除子级浮动给父级元素高度折叠的影响 */
}
.box2 {
width: 150px;
height: 150px;
background: rgb(5, 219, 41);
float: left;
}
</style>
</head>
<body>
<div class="box1">
<div class="box2"></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)
2.1绝对位置实现三列布局
<!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>Document</title>
<style>
.box {
width: 800px;
overflow: hidden;
background: burlywood;
margin: 0 auto
}
.nav {
width: 800px;
height: 50px;
background: aquamarine;
float: left;
}
.footer {
width: 800px;
height: 50px;
background: rgb(207, 158, 21);
float: left;
}
.main {
width: 800px;
min-height: 600px;
float: left;
background: rgb(31, 10, 223);
position: relative;
}
.left {
width: 200px;
height: 600px;
background: brown;
position: absolute;
left: 0;
top: 0;
}
.right {
width: 200px;
height: 600px;
background: rgb(7, 190, 53);
position: absolute;
right: 0;
top: 0;
}
.content {
margin: 0 200px;
background: beige;
height: 600px;
}
</style>
</head>
<body>
<div class="box">
<div class="nav">导航</div>
<div class="main">
<div class="left">左边</div>
<div class="content">中间</div>
<div class="right">右边</div>
</div>
<div class="footer">底部信息</div>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
2.2 浮动定位实现布局
<!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>Document</title>
<style>
.box {
width: 800px;
overflow: hidden;
background: burlywood;
margin: 0 auto
}
.nav {
width: 800px;
height: 50px;
background: aquamarine;
float: left;
}
.footer {
width: 800px;
height: 50px;
background: rgb(207, 158, 21);
float: left;
}
.main {
width: 800px;
min-height: 600px;
float: left;
background: rgb(31, 10, 223);
}
.left {
width: 200px;
height: 600px;
background: brown;
float: left;
}
.right {
width: 200px;
height: 600px;
background: rgb(7, 190, 53);
float: left;
}
.content {
width: 400px;
height: 600px;
float: left;
background: beige;
}
</style>
</head>
<body>
<div class="box">
<div class="nav">导航</div>
<div class="main">
<div class="left">左边</div>
<div class="content">中间</div>
<div class="right">右边</div>
</div>
<div class="footer">底部信息</div>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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