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Home > List of blog posts > CSS布局原理与实现（消除浮动影响，绝对定位相对定位与布局)-2019年9月4日
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CSS布局原理与实现（消除浮动影响，绝对定位相对定位与布局)-2019年9月4日
渊的博客
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  1. 实例演示如何消除子元素浮动造成父元素高度折叠的影响

实例

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>清除浮动的影响</title>
    <link rel="stylesheet" href="style2.css">
</head>
<body>
    <!-- <div class="wrap"></div> -->
        <div class="box1">
            <div class="box2">
                子元素（区块）
            </div>
            <div class="clear"></div>
        </div>
    
</body>
</html>

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实例

.box1{
    width: 150px;
    height: 150px;
    background-color: lightblue;
}
.box2{
    width: 150px;
    height: 450px;
    background-color: lightgreen;
}
.box1{
    float: left;
}
.box2{
    float: left;
}

.box3{
    width: 200px;
    height: 200px;
    background-color: lightcoral;
    float: right;
}
.box2{float: right;}

.box4{
    height: 100px;
    background-color: gray;
}
.box4{
    clear:both;
}

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2. 实例演示三列布局的实现原理( 绝对定位实现, 浮动定位实现)

绝对定位实现三列布局

实例

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <link rel="stylesheet" href="demo8.css">
    <title>三列布局: 绝对定位</title>
</head>
<body>
    <div class="container">
        <div class="header">头部</div>
        <!--    主体部分分三列布局-->
        <div class="main">
            <div class="left">左侧</div>
            <div class="content">内容区</div>
            <div class="right">右侧</div>
        </div>
        <div class="footer">底部</div>
    </div>
</body>
</html>

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实例

/*页面容器*/

.container{
    width:1000px;
    margin:0 auto;
}

/*头部与底部共用样式*/

.header,.footer{
    height:100px;
    background:lightgray;
}
/*主体*/
.main{
    marign:5px auto;
    background-color: lightblue;
}

/*主体三部分的基本样式*/
.left{
    width:200px;
    min-height: 800px;
    background-color:lightgreen;
}

.content{
    min-height:800px;
    background-color:lightgreen;
}
.right{
    width:200px;
    min-height: 800px;
    background-color:lightpink;
}

/* 绝对定位 */

/* 定位父级 */
.main{
    position: relative;
}

.left{
    position: absolute;
    left: 0;
    top: 0;
}
.right{
    position: absolute;
    right:0;
    top:0;
}

/* 用外边距margin,挤出中间内容区 */
.content{
        margin-left:210px;
        margin-right:210px;
}

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浮动定位实现三列布局



实例

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <link rel="stylesheet" href="demo9.css">
    <title>浮动定位实现三列布局</title>
</head>
<body>
    <div class="container">
        <div class="header">头部</div>
        <div class="main">
            <div class="left">左侧</div>
            <div class="content">内容区</div>
            <div class="right">右侧</div>
        </div>
        <div class="footer">底部</div>
    </div>
</body>
</html>

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实例

/*页面容器*/
.container {
    width: 1000px;
    margin: 0 auto;
}

/*头部与底部共用样式*/
.header, .footer {
    height: 120px;
    background-color: lightblue;
}

.main{
    margin: 5px auto;
    background-color: lightblue;
}

/*主体三部分的基本样式*/

.left {
    width: 200px;
    min-height: 800px;
    background-color: lightcoral;
}
.content {
    /*内容区宽度自适应*/
    min-height: 800px;
    background-color: lightseagreen;
}
.right {
    width: 200px;
    min-height: 800px;
    background-color: lightpink;
}

/*左侧左浮动*/
.left {
    float: left;
}

/*右侧右浮动*/
.right {
    float: right;
}
/*内容区设置*/
.content {
    float: left;
    width: 580px;
    margin-left: 10px;
}

/*清除子元素浮动影响*/
.main {
    overflow: hidden;
}

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Correction status：qualified

Teacher's comments：运行结果看不到, 最好把运行截图发上来就好了
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