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  • 盒模型的属性丶display显示丶浮动

    一丶盒模型的属性(重要)

      1.padding

        padding是标准文档流,父子之间调整位置

    <!DOCTYPE html>
    <html>
        <head>
            <meta charset="UTF-8">
            <title>padding</title>
            <style>
                *{
                    padding: 0;
                    margin: 0;
                }
                .box{
                    width: 200px;
                    height: 200px;
                    background-color: red;
                    /*上下左右*/
                    padding: 10px;
                    /*上下  左右*/
                    padding: 20px 30px;
                    /*上  左右  下*/
                    padding: 20px 30px 40px;
                    /*顺时针   上右下左*/
                    padding: 20px 30px 40px 50px;
                }
            </style>
        </head>
        <body>
            <div class="box">alex</div>
        </body>
    </html>
    padding

      2.border

        三要素: 线性的宽度  线性的样式  颜色

        solid 实线  dotted小圆点  double双实线  bottom虚线

    <!DOCTYPE html>
    <html>
        <head>
            <meta charset="UTF-8">
            <title>border</title>
            <style>
                *{
                    padding: 0;
                    margin: 0;
                }
                .box{
                    width: 200px;
                    height: 200px;
                    background-color: red;
                    /*根据方向来设置*/
                    border-left: 5px solid green;
                    border-right: 1px dotted yellow;
                    border-top: 5px double purple;
                    border-bottom: 1px dashed;
                }
            </style>
        </head>
        <body>
            <div class="box">alex</div>
        </body>
    </html>
    border

      实例:制作三角形

      transparent 透明

    <!DOCTYPE html>
    <html>
        <head>
            <meta charset="UTF-8">
            <title>制作三角形</title>
            <style type="text/css">
                div{
                    width: 0;
                    height: 0;
                    border-bottom: 20px solid red;
                    border-left: 20px solid transparent;
                    border-right: 20px solid transparent;
                    
                }
            </style>
            
        </head>
        <body>
            <div>
                
            </div>
        </body>
    </html>
    制作三角形

      3.margin

        前提:必须是在标准文档流下

    <!DOCTYPE html>
    <html>
        <head>
            <meta charset="UTF-8">
            <title>margin</title>
            <style>
                .s1{
                    background-color: red;
                    margin-right: 30px;
                }
                .s2{
                    background-color: rgb(0,128,0);
                    margin-left: 30px;
                }
            </style>
        </head>
        <body>
            <span class="s1">alex</span><span class="s2">wusir</span>
        </body>
    </html>
    margin

      margin垂直方向上的坑:

        margin的水平不会出现任何问题

        垂直方向上 margin会出现'塌陷问题'

    <!DOCTYPE html>
    <html>
        <head>
            <meta charset="UTF-8">
            <title>margin坑</title>
            <style>
                .s1{
                    width: 200px;
                    height: 200px;
                    background-color: red;
                    margin-bottom: 40px;
                }
                .s2{
                    width: 200px;
                    height: 200px;
                    background-color: green;
                    margin-top: 100px;
                }
            </style>
        </head>
        <body>
            <div class="s1"></div>
            <div class="s2"></div>
        </body>
    </html>
    margin(坑)
    <!DOCTYPE html>
    <html>
        <head>
            <meta charset="UTF-8">
            <title>margin父子盒子的坑</title>
            <style type="text/css">
                .box{
                width: 300px;
                height: 300px;
                background-color: red;
                /*float: left;*/
            }
                .child{
                    width: 100px;
                    height: 100px;
                    background-color: green;
                    margin-left: 50px;
                    margin-top: 50px;
            }
            </style>
        </head>
        <body>
            <div class="father">
                <div class="child">
                </div>
            </div>
        </body>
    </html>
    margin父子盒子的坑

     二丶display显示

      前提;必须是在标准文档流下

      块级元素和行内元素的相互转换:

        块级元素可以转换为行内元素:

          display:inline

          此时这个div不能设置宽度丶高度;

          此时这个div可以和别人并排了

        行内元素转换为块级元素:

          display:block

          此时这个span能够设置宽高

          此时这个span必须霸占一行了,别人无法和他并排

          如果不设置宽度,将撑满父亲

    <!DOCTYPE html>
    <html>
        <head>
            <meta charset="UTF-8">
            <title>display</title>
            <style>
                .box{
                    width: 100px;
                    height: 100px;
                    background-color: red;
                    border: 1px solid yellow;
                }
                div a{
                    display: block;
                    width: 100px;
                    height: 100px;
                }
                span{
                    display: inline-block;
                    width: 300px;
                    height: 200px;
                    background-color: yellow;
                }
            </style>
        </head>
        <body>
            <div class="box">alex</div>
            <div class="box">wusir</div>
            
            <div>
                <a href="#">
                    <img src="http://img07.tooopen.com/images/20170818/tooopen_sy_220999936848.jpg" alt="" width="300" height="300"/>
                </a>
            </div>
            
            <input type="text" /><br />
            <span>哈哈哈哈</span>
            <span>嘻嘻嘻嘻</span>
        </body>
    </html>
    display

    三丶浮动

      float :    none  表示不浮动,默认

           left:表示左浮动

           right:表示右浮动

    <!DOCTYPE html>
    <html>
        <head>
            <meta charset="UTF-8">
            <title>浮动</title>
            <style>
                *{
                    padding: 0;
                    margin: 0;
                }
                .father{
                    width: 500px;
                }
                .box1{
                    width: 100px;
                    height: 100px;
                    background-color:red;
                    float: left;
                }
                .box2{
                    width: 100px;
                    height: 300px;
                    background-color:green;
                    float: left;
                }
                .box3{
                    width: 100px;
                    height: 100px;
                    background-color:blue;
                    float: left;
                }
                .father2{
                    width: 600px;
                    height: 200px;
                    background-color: yellow;
                }
            </style>
        </head>
        <body>
            <div class="father">
                <div class="box1">1</div>
                <div class="box2">2</div>
                <div class="box3">3</div>
            </div>
            <div class="father2">
                
            </div>
        </body>
    </html>
    浮动

      我们该如何清除浮动呢?有以下几种方法

    <!DOCTYPE html>
    <html>
        <head>
            <meta charset="UTF-8">
            <title>清除浮动</title>
            <style>
                *{
                    padding: 0;
                    margin: 0;
                }
                .father{
                    width: 500px;
                    height: 300px;
                }
                .box1{
                    width: 100px;
                    height: 100px;
                    background-color:red;
                    float: left;
                }
                .box2{
                    width: 100px;
                    height: 300px;
                    background-color:green;
                    float: left;
                }
                .box3{
                    width: 100px;
                    height: 100px;
                    background-color:blue;
                    float: left;
                }
                .father2{
                    width: 600px;
                    height: 200px;
                    background-color: yellow;
                }
            </style>
        </head>
        <body>
            <div class="father">
                <div class="box1">1</div>
                <div class="box2">2</div>
                <div class="box3">3</div>
            </div>
            <div class="father2">
                
            </div>
        </body>
    </html>
    固定高度
    <!DOCTYPE html>
    <html>
        <head>
            <meta charset="UTF-8">
            <title>清除浮动</title>
            <style>
                *{
                    padding: 0;
                    margin: 0;
                }
                .father{
                    width: 500px;
                }
                .box1{
                    width: 100px;
                    height: 100px;
                    background-color:red;
                    float: left;
                }
                .box2{
                    width: 100px;
                    height: 300px;
                    background-color:green;
                    float: left;
                }
                .box3{
                    width: 100px;
                    height: 100px;
                    background-color:blue;
                    float: left;
                }
                .father2{
                    width: 600px;
                    height: 200px;
                    background-color: yellow;
                }
                .clearfix{
                    clear:both;
                }
            </style>
        </head>
        <body>
            <div class="father">
                <div class="box1">1</div>
                <div class="box2">2</div>
                <div class="box3">3</div>
                <!-- 内墙法 -->
                <div class="clearfix"></div>
            </div>
            <div class="father2">
                
            </div>
        </body>
    </html>
    clearfix内墙法

          visibility:hidden; 设为隐藏

    <!DOCTYPE html>
    <html>
        <head>
            <meta charset="UTF-8">
            <title>伪元素清除法</title>
            <style>
                *{
                    padding: 0;
                    margin: 0;
                }
                .father{
                    width: 500px;
                }
                .box1{
                    width: 100px;
                    height: 100px;
                    background-color:red;
                    float: left;
                }
                .box2{
                    width: 100px;
                    height: 300px;
                    background-color:green;
                    float: left;
                }
                .box3{
                    width: 100px;
                    height: 100px;
                    background-color:blue;
                    float: left;
                }
                .father2{
                    width: 600px;
                    height: 200px;
                    background-color: yellow;
                }
                
                .clearfix:after{
                    content: '.';
                    clear: both;
                    display: block;
                    visibility: hidden;
                    height: 0;
                }
            </style>
        </head>
        <body>
            <div class="box">
                <div class="father clearfix">
                    <div class="box1">1</div>
                    <div class="box2">2</div>
                    <div class="box3">3</div>
                    
                </div>
            </div>
            <div class="father2"></div>
        </body>
    </html>
    伪元素清除法
    <!DOCTYPE html>
    <html>
        <head>
            <meta charset="UTF-8">
            <title>伪元素清除法</title>
            <style>
                *{
                    padding: 0;
                    margin: 0;
                }
                .father{
                    width: 500px;
                    overflow: hidden;
                }
                .box1{
                    width: 100px;
                    height: 100px;
                    background-color:red;
                    float: left;
                }
                .box2{
                    width: 100px;
                    height: 300px;
                    background-color:green;
                    float: left;
                }
                .box3{
                    width: 100px;
                    height: 100px;
                    background-color:blue;
                    float: left;
                }
                .father2{
                    width: 600px;
                    height: 200px;
                    background-color: yellow;
                }
            </style>
        </head>
        <body>
            <div class="box">
                <div class="father">
                    <div class="box1">1</div>
                    <div class="box2">2</div>
                    <div class="box3">3</div>
                    
                </div>
            </div>
            <div class="father2"></div>
        </body>
    </html>
    overflow清除法
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  • 原文地址:https://www.cnblogs.com/qicun/p/9675615.html
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