Css基础之浮动与布局（绝对定位、浮动定位实现三列布局）—2019年9月5日 - PHP学习

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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>子元素浮动造成父元素高度折叠</title>
    <style>
    .box1 {
        background-color: coral;
        border: 4px solid #333;
          /* 解决办法 1*/
        /* overflow: hidden; */
    }

    img {
        width: 70px;
        height: 70px;
        float: left;
    }
    .box2 {
        width: 100px;
        height: 100px;
        background-color: aquamarine;
        float: left;
    }
    /* .clear { */
        /* clear: both; */
    /* } */
     /* 解决办法3 */
     div::after {
        content:"";
        display: block;
        clear:both;
    }
    </style>
</head>
<body>
    <div class="box1">
        <img src="1.jpg">
        <div class="box2"></div>
        <!-- 解决办法2 -->
        <!-- <div class="clear"></div> -->
    </div>
</body>
</html>

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作业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)

三列布局指的是两边定宽、中间自适应的布局，可以通过绝对定位或者浮动定位实现

绝对定位（左右两栏选择绝对定位，固定于页面的两侧，中间的主体选择用margin确定位置）

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>绝对定位实现三列布局</title>
    <style>
    * {
        margin: 0;
        padding: 0;
    }

    .left {
        width: 200px;
        height: 500px;
        background-color: blanchedalmond;
        position: absolute;
        left: 0;
        top: 0;
    }
    .main {
        background-color: lightpink;
        height: 600px;
        margin-left: 200px;
        margin-right: 200px; 
    }
    .right {
        width: 200px;
        background-color: blanchedalmond;
        height: 500px;
        position: absolute;
        right: 0;
        top:0;
    }

    </style>
</head>
<body>

    <div class="left">左侧</div>
    <div class="main">主体</div>
    <div class="right">右侧</div>

</body>
</html>

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效果：

浮动定位（让左右两边部分浮动，脱离文档流后对中间部分使用margin来自适应）

注意要先写左右，中间部分最后加载

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>浮动方法实现三列布局</title>
    <style>
        * {
             margin: 0;
             padding: 0;
        }
        
        .left {
            width: 200px;
            height: 500px;
            background-color: blanchedalmond;
            float: left;

        }
        .right {
            width: 200px;
            background-color: blanchedalmond;
            height: 500px;
            float:right;
        }
        .main {
            background-color: lightpink;
            height: 600px;
            margin: 0 200px;
        }
            </style>
</head>
<body>
    <div class="left">左侧</div>
    <div class="right">右侧</div> 
    <div class="main">主体</div>  
</body>
</html>

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效果如图：

总结：绝对定位很好理解，设置好数值让盒子部分偏移就行；浮动方式更简洁方便，不过要注意先写两侧，最后写中间。中间部分是主体，最后加载的话，用户体验不是很好，使用的时候需要注意。

Correction status：qualified

Teacher's comments：你总结的非常对, 定位是布局的基础

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