关于 background-attachment 属性详解

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <div class="div1">
        <p>1</p><p>1</p>
        <p>1</p><p>1</p>
        <p>1</p><p>1</p>
        <p>1</p><p>1</p>
        <p>1</p><p>1</p>
        <p>1</p><p>1</p>
        <p>1</p><p>1</p>
        <p>1</p><p>1</p>
        <p>1</p><p>1</p>
    </div>
    <div class="div2"></div>
    <style>
        .div1 {
             background-image: url("../img/qier.png");
             width: 100px;
             height: 400px;
             overflow: scroll;
        }
        .div2{
            background-color: white;
            width: 100px;
            height: 3000px;
        }
    </style>
</body>
</html>

        .div1 {
             background-image: url("../img/qier.png");
             width: 100px;
             height: 400px;
             overflow: scroll;
             background-attachment: fixed;
        }

        .div1 {
             background-image: url("../img/qier.png");
             width: 100px;
             height: 400px;
             overflow: scroll;
             background-attachment: local;
        }