父子元素均設置：position：absolute
子元素的寬度爲自適應。由內容決定
<!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>
</head>
<body>
<div style="position:absolute">
<div style="position:absolute">
<span>test1</span>
<span>test1</span>
<span>test1</span>
<span>test1</span>
</div>
</div>
</body>
</html>
不懂啊