<html>
<head>
<meta name="viewport" content="width=device-width"charset="utf-8">
<title>无标题文档</title>
<style>
html,body{
width:100%;
height:100%;
}
*{
margin:0px;
padding:0px;
}
body{
margin:0px;
padding:0px;
}
.one{
position:fixed;
left:0px;
right:0px;
background-color:#003;
width:190px;
height:100%;
}
.two{
float:left;
width:100%;
margin-top:15px;
height:100%;
}
.four{
margin-left:200px;
margin-right:310px;
height:100%;
background-color:#F03;
}
.three{
width:300px;
margin-left:-300px;
height:100%;
background-color:#0F6;
float:left;
margin-top:15px;
}
@media screen and(max-width:980px)
{
.three{
display:none;
}
.four{
margin-right:0px;
}
}
@media only screen and(max-width:764px)
{
.one{
display:none;
}
.four{
margin-left:0px;
}
}
</style>
</head>
<body>
<div class="one"></div>
<div class="two">
<div class="four"></div>
</div>
<div class="three"></div>
</body>
</html>
因为and后面需要一个空格
这是要实现个什么功能啊