实例-div换行显示-Web响应式布局入门到实战

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实现效果：三个div，当屏幕尺寸较大时，一行显示，缩小后显示两个并换行，再缩小一行只显示一个。

```
<!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>
        .div0{
            width:100%;
            height:500px;
            border:1px solid #ccc;
        }
        /* 子div浮动一行显示 */
        .div0 div{
            float:left;
            height:200px;
        }
        /* 一行3个div */
        @media screen and (min-width:400px){
            .div0 div{
                width: 33.3%;
            }
            .div0 div:nth-child(1){
               background-color: red; 
            }
            .div0 div:nth-child(2){
               background-color: green; 
            }
            .div0 div:nth-child(3){
               background-color: blue; 
            }
        }
        /* 两行3个div */
        @media screen and (min-width:300px) and (max-width:399px){
            .div0 div{
                width: 50%;
            }
            .div0 div:nth-child(1){
               background-color: red; 
            }
            .div0 div:nth-child(2){
               background-color: green; 
            }
            .div0 div:nth-child(3){
               background-color: blue; 
            }
        }
        /* 三行3个div */
        @media screen and (min-width:200px) and (max-width:299px){
            .div0 div{
                width: 100%;
            }
            .div0 div:nth-child(1){
               background-color: red; 
            }
            .div0 div:nth-child(2){
               background-color: green; 
            }
            .div0 div:nth-child(3){
               background-color: blue; 
            }
        }
    </style>
</head>
<body>
    <div class="div0">
        <div></div>
        <div></div>
        <div></div>
    </div>
    
</body>
</html>
```

![](/uploads/images/20230421/998d2e1078635a00a7c42aa3e042258b.png)

![](/uploads/images/20230421/6ba4bc731868cef322d8059dbca47495.png)

![](/uploads/images/20230421/98904221ca22a0b1eba6e922ea7d3068.png)

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