彈性布局，又稱“Flex布局”
給父容器添加display: flex/inline-flex;屬性，即可使容器內容採用彈性布局顯示，而不遵循常規文檔流的顯示方式
容器添加彈性布局後，僅僅是容器內容採用彈性布局，而容器自身在文檔流中的定位方式依然遵循常規文檔流；
display:flex; 容器添加彈性布局後，顯示為區塊層級元素；
display:inline-flex; 容器添加彈性布局後，顯示為行級元素；
設為 Flex布局後，子項目的float、clear和vertical-align屬性將失效。但是position屬性，依然生效。
代碼如下：
<!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>Document</title> <style> *{ margin: 0; padding: 0; } .box{ display: flex; } .box p{ height: 50vh; flex: 1; } .box p:nth-child(1){ background: gray; } .box p:nth-child(2){ background: green; } .box p:nth-child(3){ background: pink; flex: 3; } .box p:nth-child(4){ background: red; } .box p:nth-child(5){ background: yellow; } </style></head><body> <p class="box"> <p>1</p> <p>2</p> <p>3</p> <p>4</p> <p>5</p> </p></body></html>
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