<!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:0px; padding:0px; } .test{ background-color: pink; height: 100%; width:100%; position:absolute; } </style> </head> <body> <div class="test"> fdsaf </div> </body> </html>
position如果不设置，body里的div height百分比设置不起作用，具体数值才起作用