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0327课后作业
张成钢的博客
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实例

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>经典的三列圣杯布局</title>
	<style type="text/css">
		div {
			text-align: center;
			color: red;
		}
		.header,.footer {
				width: 100%;
				height: 60px;
				background-color: lightgray;
				}

		.content {
				width: 1000px;
				min-height: 100%;
				background-color: gray;
				margin: auto;
				line-height: 60px;
				}

		.footer {clear: both;}

		.container {
			width: 700px;
			margin: auto;
			background-color: yellow;
			overflow: hidden;
			padding: 0px 150px;
		}

		.main,.left,.right {
			min-height: 450px;
			float: left;
		}
		.container .main {
			width: 100%;
			background-color: skyblue;
		}

		.container .left {
			width: 150px;
			background-color: lightgreen;
			margin-left: -100%;
			position: relative;
			left: -150px;
		}

		.container .right {
			width: 150px;
			background-color: wheat;
			margin-left: -150px;
			position: relative;
			right: -150px;		
		}	

	</style>
</head>
<body>

	<div class="header">
		<div class="content">网站头部</div>
	</div>

	<!-- 主体 -->
	<div class="container">
		<div class="main">主体</div>
		<div class="left">左侧</div>
		<div class="right">右侧</div>
	</div>

	<!-- 底部 -->
	<div class="footer">
		<div class="content">网站底部</div>
	</div>

<pre>
		三列圣杯布局原理：
		1.创建大容器，居中；
		2.三区块 main + left +right = 总宽,main left right 顺序不能错；
		3.三区块 全部float:left;
		4.left区块定位 margin-left:-100%, right区块定位：margin-left:-150px
		5.main添加内边距=left right 区块宽度，挤压；
		6.区块left相对移动 左-150px  right相对移动右-150px

</pre>


</body>
</html>

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0327-1.png0327-2.png

实例

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>经典的三列双飞翼布局</title>
	<style type="text/css">
		div {
			text-align: center;
			color: red;
		}
		.header,.footer {
			width: 100%;
			height: 60px;
			background-color: lightgray;
		}

		.footer {clear: both;}

		.content {
			width: 1000px;
			min-height: 100%;
			background-color: gray;
			margin: auto;
			line-height: 60px;
		}

		.container {
			width: 1000px;
			margin: auto;
			background-color: yellow;
		}

		.wrap {
			width: 100%;
			float: left;
			background-color: cyan;
			/*margin: 0 200px;*/
		}

		.left ,.right ,.main {
			min-height: 600px;
		}

		.main {
			margin: 0 200px;
			background-color: #fff;			
		}

		.left , .right {
			width: 200px;
			float:left;
		}

		.left {
			background-color: skyblue;
			margin-left:-100%;
		}

		.right {
			background-color: lightgreen;
			margin-left: -200px;
		}

	</style>
</head>
<body>
	<div class="header">
		<div class="content">网站头部</div>
	</div>

	<div class="container">
		<div class="wrap">
			<div class="main">主体</div>
		</div>
		<div class="left">左侧</div>
		<div class="right">右侧</div>
	</div>

	<!-- 底部 -->
	<div class="footer">
		<div class="content">网站底部</div>
	</div>

	<pre>
		双飞翼布局原理：
		1.创建大容器，居中；
		2.创建三列结构；
			2.1 主体 左 右 顺序不能错；
			2.2 主体列必须套父块main，加样式；
			2.3 父块main宽度100%,左left 右right 列定宽；
		3.设置main/left/right 左浮动；(理解左浮动原理)
		4.设置left margin-left:-100% 左缩进
		5.设置right margin-left:-200px 左缩进
		6.main左右外边距 200px
	</pre>

</body>
</html>

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点击 "运行实例" 按钮查看在线实例


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