两栏式布局和三栏式布局

两栏式布局

要求：先加载内容区域，内容区域宽度自适应

1.使用绝对定位

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>两栏布局</title>
<style type="text/css">
*{
    margin: 0;
    padding: 0;
}
/* 使用position:absolute */
.left{
    position: absolute;
    top: 0;
    left: 0;
    width: 200px;
    height: 200px;
    background-color: red;
}
.main{
    margin-left: 200px;
    height: 200px;
    background-color: blue;
}
</style>
</head>
<body>
    <!-- 两栏布局，先加载内容区域 -->
    <div class="main"></div>
    <div class="left"></div>    
</body>
</html>

2.使用浮动

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>两栏布局</title>
<style type="text/css">
*{
    margin: 0;
    padding: 0;
}
/* 使用float解决 */
.main{
    float: left;
    margin-left: 200px;
    width: 100%;
    height: 200px;
    background-color: blue;
}
.left{
    width: 200px;
    height: 200px;
    background-color: red;
}
</style>
</head>
<body>
    <!-- 两栏布局，先加载内容区域 -->
    <div class="main"></div>
    <div class="left"></div>    
</body>
</html>

三栏式布局

要求：两边宽度固定，中间自适应

（1）先加载内容中间区域

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>三栏式布局</title>
<style type="text/css">
*{ 
    margin: 0; 
    padding: 0; 
}
.container{
    width: 100%;
    height: 100%;
}
.main{
    width: auto;
    margin-left: 200px;
    margin-right: 300px;
    background-color: red;
}
.left{
    position: absolute;
    width: 200px;
    left: 0;
    top: 0;
    background-color: yellow;
}
.right{
    position: absolute;
    width: 300px;
    right: 0;
    top: 0;
    background-color: green;
}

</style>
</head>
<body>
    <div class="container">
        <div class="main">main</div>
        <div class="left">left</div>
        <div class="right">right</div>
    </div>    
</body>
</html>

（2）后加载内容中间区域

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>三栏式布局</title>
<style type="text/css">
*{
    margin: 0;
    padding: 0;
}

/* 使用float解决 */
.left{
    float: left;
    width: 200px;
    height: 200px;
    background-color: red;
}
.right{
    float: right;
    width: 200px;
    height: 200px;
    background-color: yellow;
}
.main{
    width: 100%;
    height: 200px;
    background-color: blue;
}
</style>
</head>
<body>
    <!-- 三栏式布局 两边宽度固定，中间自适应-->
    <div class="left"></div>    
    <div class="right"></div>    
    <div class="main"></div>
</body>
</html>
posted @ 2017-08-18 10:34  gq_orange  阅读(715)  评论(0)  编辑  收藏  举报