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批改状态：合格
老师批语：只有代码, 没有说明, 没有总结 , 不算是完整
<!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>
<link rel="stylesheet" href="/public/static/index/css/demo1.css?a={:time()}">
</head>
<style>
.div {
border: solid 2px red;
/* 使用overflow:hidden 来消除元素浮动对父类的影响 */
overflow: hidden;
padding: 20px;
}
.div>div {
float: left;
height: 500px;
width: 33.3%;
}
.left {
background: lightseagreen;
}
.content {
background: lightpink;
}
.right {
background: limegreen;
}
</style>
<body>
<div class="div">
<div class="left"></div>
<div class="content"></div>
<div class="right"></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)
<!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>
<link rel="stylesheet" href="/public/static/index/css/demo1.css?a={:time()}">
</head>
<style>
.main {
border: solid 2px red;
/* 使用overflow:hidden 来消除元素浮动对父类的影响 */
overflow: hidden;
height: 800px;
}
.main>div {
height: 800px;
width: 33.33%;
text-align: center;
line-height: 800px;
}
.left {
background: lightseagreen;
}
.content {
background: lightpink;
position: relative;
top: -800px;
left: 33.33%;
}
.right {
background: limegreen;
position: relative;
top: -1600px;
left: 66.66%;
}
</style>
<body>
<div class="main">
<div class="left"> 左版块</div>
<div class="content">内容区</div>
<div class="right">右版块</div>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
<!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>
<link rel="stylesheet" href="/public/static/index/css/demo1.css?a={:time()}">
</head>
<style>
.main {
border: solid 2px red;
/* 使用overflow:hidden 来消除元素浮动对父类的影响 */
height: 800px;
margin: 0;
padding: 0;
position: relative;
}
body {
margin: 0;
padding: 0;
}
.main>div {
height: 800px;
width: 33.33%;
text-align: center;
line-height: 800px;
}
.left {
background: lightseagreen;
}
.content {
background: lightpink;
position: absolute;
top: 0px;
left: 33.33%;
}
.right {
background: limegreen;
position: absolute;
top: 0px;
left: 66.66%;
}
</style>
<body>
<div class="main">
<div class="left"> 左版块</div>
<div class="content">内容区</div>
<div class="right">右版块</div>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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