CSS3背景固定——background-attachment:fixed；

时间：2024-01-29 10:24:28

了解background-attachment属性

值描述
scroll 背景图片随着页面的滚动而滚动，这是默认的。并不随着div内的滚动而滚动（比如文本大于元素高度时的滚动，背景图不动）
fixed 背景图片不会随着元素或页面的滚动而滚动。
local 背景图片会随着元素或页面的滚动而滚动。
initial 表示默认值。
inherit 表继承

fixed值

写HTML ，当背景图片大于元素高度时，设置background-attachment:fixed; 当页面滚动，当前元素就可以得到不一样的背景图，很好看。

<!DOCTYPE html>
<html lang="cn">
    <head>
        <title>移动</title>
        <mate charset="UTF-8">
    </head>
    <style>
        body{
            padding: 0;
            margin: 0;
            font-family:Raleway,Helvetica,arial;
        }
        #bg-img{
            background-image: url("https://ld-wp.template-help.com/rockthemes/21999/wp-content/uploads/2018/03/home_paralax2.jpg");
            background-position: center center;
            background-attachment: fixed;
            background-repeat: no-repeat;
            background-size: cover;
            transition: background 0.3s, border 0.3s, border-radius 0.3s, box-shadow 0.3s;
            padding: 121px 0px 120px 0px;
            position: relative;
        }
        #bg-img::after{
            content: " ";
            height: 100%;
            width: 100%;
            top: 0;
            left: 0;
            position: absolute;
            background-color: #000000;
            opacity: 0.65;
            z-index: 1;
        }
        .empty{
            height: 800px;
            background-color: bisque;
        }
        #bg-img ul{
            padding:20px;
            margin: 0;
            position: relative;
            z-index: 2;
        }
        #bg-img li{
            line-height: 30px;
            list-style-type: none;
            text-align: center;
            color: #fff;
        }
    </style>
    <body>
        <div class="empty">
         空
        </div>
        <section id="bg-img">
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        </section>
        <div class="empty">
            空
        </div>
    </body>
</html>