响应式布局实例

2018-09-08 网页编程网 网页编程网

<!doctype html>
<html>
<head>
    <meta charset="utf-8"/>
    <title>响应式</title>
    <style>
*{
    margin:0;
    padding:0;
    text-align:center;
    color:yellow; 
}
.header{
    width:100%;
    height:100px;
    background:#ccc;
    line-height:100px;
}
.main{
    background:green;
    width:100%;
}
.clearfix:after{
    display:block;
    height:0;
    content:"";
    visibility:hidden;
    clear:both;
}
.left,.center,.right{
    float:left;
}
.left{
    width:20%;
    background:#112993;
    height:300px;
    font-size:50px;
    line-height:300px;
}
.center{
    width:60%;
    background:#ff0;
    height:400px;
    color:#fff;
    font-size:50px;
    line-height:400px;
}
.right{
    width:20%;
    background:#f0f;
    height:300px;
    font-size:50px;
    line-height:300px;
}
.footer{
    width:100%;
    height:50px;
    background:#000;
    line-height:50px;
}
</style>
<style media="screen and (max-width:1024px) and (min-width:720px)">
    .right{
        float:none;
        width:100%;
        background:#f0f;
        clear:both;
    }
    .left{
        width:30%;
    }
    .center{
        width:70%;
    }
    .main{
        height:800px;
    }
</style>
<style media="screen and (max-width:720px)">
    .left,.center,.right{
        float:none;
        width:100%;
    }
</style>
</head>
<body>
    <div class="header">头部</div>
    <div class="main clearfix">
        <div class="left">左边</div>
        <div class="center">中间</div>
        <div class="right">右边</div>
    </div>
    <div class="footer">底部</div>
</body>
</html>

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