position:fixed属性用法详解

来源：百万美食网

<!DOCTYPE html>
<html>
<head>
<title>当锚点定位遇上position: fixed</title>
<style type="text/css">
* {
margin: 0;
padding: 0;
}

body {
position: relative;
}

a {
color: white;
text-decoration: none;
}

.nav {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100px;
background-color: black;
}

.part-one,
.part-two,
.part-three {
width: 100%;
height: 800px;
}

.part-one {
background-color: red;
padding-top: 100px;
}

.part-two {
background-color: blue;
padding-top: 100px;
margin-top: -100px;
}

.part-three {
background-color: yellow;
padding-top: 100px;
margin-top: -100px;
}
</style>
</head>
<body>
<div class="nav">
<a href="#part-one">part one</a>
<a href="#part-two">part two</a>
<a href="#part-three">part three</a>
</div>
<div class="part-one" id="part-one">I'm part one</div>
<div class="part-two" id="part-two">I'm part two</div>
<div class="part-three" id="part-three">I'm part three</div>
</body>
</html>

<!DOCTYPE html>
<html>

	<head>
	<title>CSS解决有固定导航时链接锚点定位偏移</title>
	<style type="text/css">
	* {
	margin: 0;
	padding: 0;
	}
	
	body {
	position: relative;
	}
	
	a {
	color: white;
	text-decoration: none;
	}
	
	.nav {
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	height: 100px;
	background-color: black;
	}
	
	.part-one,
	.part-two,
	.part-three {
	width: 100%;
	height: 800px;
	}
	
	.part-one {
	background-color: red;
	padding-top: 100px;
	}
	
	.part-two {
	background-color: blue;
	padding-top: 100px;
	margin-top: -100px;
	}
	
	.part-three {
	background-color: yellow;
	padding-top: 100px;
	margin-top: -100px;
	}
	</style>
	</head>

	<body>
	<div class="nav">
	<a href="#part-one">part one</a>
	<a href="#part-two">part two</a>
	<a href="#part-three">part three</a>
	</div>
	<div class="part-one" id="part-one">I'm part one</div>
	<div class="part-two" id="part-two">I'm part two</div>
	<div class="part-three" id="part-three">I'm part three</div>
	</body>

</html>