【CSS知识点】——display属性详解

在CSS中di s play 属性表示“显示框类型“，即不同的盒模型。简单来说，可以把块级盒子转成内联盒子，也可以把内联盒子转换为块级盒子。

&lt;!DOCTYPE html&gt;
&lt;html lang="en"&gt;
&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    <meta http-equiv="X-UA-Compatible" content="IE=edge"&gt;
    <meta name="viewport" content="width=device-width, initial-scale=1.0"&gt;
    <title>Document</title>
    <style>
        .box1{
            display: block;
            background-color: skyblue;
        }
        .box2{
            display: inline;
            background-color: pink;
        }
    </style>
</head>
<body>
    <div class="box1">块元素</div>
    <div class="box1">块元素</div>
    <span class="box2">行内元素</span >
    <span class="box2">行内元素</span >
</body>
</html>

展示效果如下：
display
可以看到，div具备了内联盒子的特性，而s pan则具备了块级盒子的特性。（块级元素和行内元素的区别）但是display远比这个复杂的多，其中弹性布局、网格布局等都是跟display有着紧密关系。

display分类

外部值就是定义自身元素的外部表现，而不影响其内的子元素。

b lock：将元素表示为块级元素
inline：将元素表示为内联盒子
run–in：实际是块元素和行内元素的混合，可以使某些元素成为下一个块级框元素的行内部分。实验性质的属性，浏览器兼容不好

和外部值相反，内部值就死定义子元素布局的。像flex，grid这些都会影响到子元素的布局形式。

flow–root：一个BFC的块级盒子（注：BFC后面小节会讲解）
table：带有内部表格布局的块级盒子。
flex：带有内部弹性布局的块级盒子
grid：带有内部网格布局的块级盒子

<!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>Document</title>
    <style>
        .grid{
            box-shadow: 0 0 1px  #f6f;
            width: 300px;
            height: 300px;
            background-color: aqua;
            display: grid;
            grid-template-columns:repeat(3,100px);
            grid-template-rows:repeat(3,100px);
        }
        .grid div{
            line-height: 100px;
            text-align: center;
        }
    </style>
</head>

<body>
    <div class="grid">
        <div>1</div>
        <div>2</div>
        <div>3</div>
        <div>4</div>
        <div>5</div>
        <div>6</div>
        <div>7</div>
        <div>8</div>
        <div>9</div>
    </div>
</body>
</html>

<!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>Document</title>
    <style>
        .main {
            width: 300px;
            height: 200px;
            background: skyblue;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .box{
            width: 100px;
            height: 100px;
            background-color: pink;
        }
    </style>
</head>

<body>
    <div class="main">
        <div class="box"></div>
    </div>
</body>
</html>

<!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>Document</title>
    <style>
        .main {
            height: 100vh;
            background: skyblue;
            display: flex;
        }

        .box1 {
            width: 200px;
            background: pink;
        }

        .box2 {
            width: 100px;
            background: tan;
            flex-grow: 1;
        }
    </style>
</head>

<body>
    <div class="main">
        <div class="box1"></div>
        <div class="box2"></div>
    </div>
</body>

</html>

<!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>Document</title>
    <style>
        .main {
            height: 100vh;
            background: skyblue;
            display: flex;
        }

        .box1 {
            width: 200px;
            background: pink;
        }

        .box2 {
            width: 100px;
            background: red;
            flex-grow: 1;
        }
        .box3 {
            width: 100px;
            background: purple;
        }
    </style>
</head>

<body>
    <div class="main">
        <div class="box1"></div>
        <div class="box2"></div>
        <div class="box3"></div>
    </div>
</body>
</html>

<!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>Document</title>
    <style>
        .content{
            width: 500px;
            height: 500px;
            display: contents;
            background-color: aqua;
        }
        .content div{
            width: 100px;
            height: 100px;
            background-color: blue;
            font-size: 20px;
            text-align: center;
        }
    </style>
</head>

<body>
    <div class="content">
        <div>1</div>
        <div>2</div>
        <div>3</div>
    </div>
</body>
</html>