3---设计案例样式文件的另一种引入方式

1.main.html:

	
		
		
		<>
		
		
		
		
	
		
	
		

			
header
			
left
			
main
			
right
			
footer
		
	

2.style.css:

body {
	padding:0;
	margin:0;
	border:0;
}

h1 {
	font-size:50px;
	color:gold;
	text-align:center;
}

#container {
	width:1280px;
	margin:0 auto;
	background:red;
}

#head {
	width:100%;
	line-height:100px;
	float:left;
	margin:10px 0;
	background:#000;
}

#left {
	width:200px;
	line-height:580px;
	float:left;
	background:#000;
}

#main {
	width:860px;
	line-height:580px;
	float:left;
	margin:0 10px;
	background:#000;
}

#right {
	width:200px;
	line-height:580px;
	float:right;
	background:#000;
}

#foot {
	width:100%;
	line-height:100px;
	float:left;
	margin:10px 0;
	background:#000;
}

/*以下针对宽度1550px以上的平台，如PC。*/
@media screen and (min-width:1550px) {
	
}
 
  /*pad 1000--1550px*/@media screen and (min-width:1000px) and (max-width:1550px){}/*手机420--1000px*/@media screen and (max-width:1000px) {} 
  
 
  
 
  3.pc.css: 
  
 
  
 
  
/*以下针对宽度1000px以上的平台，如PC。*/
	
h1 {
	color:teal;
}	
 
  
 4.pad.css: 
  
 
  
 
  
h1 {
	font-size:40px;
	color:green;
}

#container {
	width:600px;
}

#left {
	width:100px;
}

#main {
	width:490px;
	margin-left:10px;
	margin-right:0;
}

#right {
	display:none;
}
 
  
 5.phone.css: 
  
 
  
 
  
h1 {
	font-size:30px;
	color:red;
}

#container {
	width:400px;
}

#head {
	line-height:80px;
}

#left {
	display:none;
}

#main {
	width:100%;
	line-height:400px;
	margin:10px 0;
}

#right {
	display:none;
}

#foot {
	width:100%;
	line-height:80px;
}