我们用最简单的两句话概括：
display:none 隐藏元素后，不占位；
visibility:hidden 隐藏元素后，占位；
display:none示例如下：
<!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>
</head>
<body>
<h1>display元素</h1>
<p>这是段落一</p>
<p style="display: none;">这是段落二</p>
<p>这是段落三</p>
</body>
</html>
visibility:hidden示例如下:
<!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>
</head>
<body>
<h1>visibility元素</h1>
<p>这是段落一</p>
<p style="visibility: hidden;">这是段落二</p>
<p>这是段落三</p>
</body>
</html>
