CSS处理页面元素浮动的几个办法

CSS处理页面元素浮动的几个办法

  1. 不使用浮动的情况下,子盒子1和2分别在盒子1中占据一行的空间。
DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>未使用浮动title>
    <style>
        .box1 {
            height: 200px;
            width: 600px;
            background-color: pink;
        }

        .box2 {
            width: 600px;
            height: 240px;
            background-color: purple;
        }

        .son1 {
            width: 150px;
            height: 100px;
            background-color: skyblue;
        }

        .son2 {
            width: 300px;
            height: 100px;
            background-color: hotpink;
        }
    style>
head>
<body>
    <div class="box1">
        <div class="son1">div>
        <div class="son2">div>
    div>
    <div class="box2">div>
body>
html>

CSS处理页面元素浮动的几个办法_第1张图片

  1. 使用添加额外标签的方法清除浮动,子盒子1和2分别使用左浮动, 两个元素都不占用原来文档流的空间了,跑到了同一行,额外添加一个div标签,清除浮动,避免盒子2也随着向上占据盒子1的空间。
DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>清除浮动 - 额外标签title>
    <style>
        .box1 {
            /* height: 200px; 很多情况下,不方便给父级盒子高度,考虑到孩子高度会变化 */
            width: 600px;
            background-color: pink;
        }

        .box2 {
            width: 600px;
            height: 240px;
            background-color: purple;
        }

        .son1 {
            width: 150px;
            height: 100px;
            background-color: skyblue;
            float: left;
        }

        .son2 {
            width: 300px;
            height: 100px;
            background-color: hotpink;
            float: left;
        }

        .clearfix {
            clear: both;
        }
    style>
head>
<body>
    <div class="box1">
        <div class="son1">div>
        <div class="son2">div>
        <div class="clearfix">div>
    div>
    <div class="box2">div>
body>
html>

CSS处理页面元素浮动的几个办法_第2张图片

  1. 使用双伪元素的方式清除浮动
DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>清除浮动 - 双伪元素title>
    <style>
        .box1 {            
            width: 600px;
            background-color: pink;
        }

        .box2 {
            width: 600px;
            height: 240px;
            background-color: purple;
        }

        .son1 {
            width: 150px;
            height: 100px;
            background-color: skyblue;
            float: left;
        }

        .son2 {
            width: 300px;
            height: 100px;
            background-color: hotpink;
            float: left;
        }

        .clearfix:before, .clearfix:after {
            content: "";
            /* 触发BFC 防止外边距合并 */
            display: table;
        }

        .clearfix:after {
            clear: both;
        }
    style>
head>
<body>
    <div class="box1 clearfix">
        <div class="son1">div>
        <div class="son2">div>
    div>
    <div class="box2">div>
body>
html>
  1. 使用after伪元素的方式清除浮动
DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>清除浮动 - after伪元素title>
    <style>
        .box1 {            
            width: 600px;
            background-color: pink;
        }

        .box2 {
            width: 600px;
            height: 240px;
            background-color: purple;
        }

        .son1 {
            width: 150px;
            height: 100px;
            background-color: skyblue;
            float: left;
        }

        .son2 {
            width: 300px;
            height: 100px;
            background-color: hotpink;
            float: left;
        }

        .clearfix:after {
            /* 内容为小点,尽量加不要空,否则低版本浏览器有空隙 */
            content: ".";
            display: block;
            height: 0;
            /* 隐藏盒子 */
            visibility: hidden;
            clear: both;
        }

        .clearfix {
            *zoom: 1;
        }
    style>
head>
<body>
    <div class="box1 clearfix">
        <div class="son1">div>
        <div class="son2">div>
    div>
    <div class="box2">div>
body>
html>
  1. 使用父级元素的overflow属性清除浮动,盒子1设置overflow为hidden,触发BFC达到清除浮动的目的。
DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>清除浮动 - 父级overflowtitle>
    <style>
        .box1 {
            width: 600px;
            background-color: pink;
            /* 触发BFC BFC可以清除浮动 */
            overflow: hidden; 
        }

        .box2 {
            width: 600px;
            height: 240px;
            background-color: purple;
        }

        .son1 {
            width: 150px;
            height: 100px;
            background-color: skyblue;
            float: left;
        }

        .son2 {
            width: 300px;
            height: 100px;
            background-color: hotpink;
            float: left;
        }
    style>
head>
<body>
    <div class="box1">
        <div class="son1">div>
        <div class="son2">div>
    div>
    <div class="box2">div>
body>
html>

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