css 页面滚动多背景固定不动

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经常看到一些网站，滚动页面但是背景图不会跟着滚动，好像一直固定在浏览器窗口，感觉挺酷的，哇哦 ~ ~

原来都是 background-attachment 这位大兄弟的功劳

background-attachment：需要配合background-image一起使用

scroll：默认值，背景随内容滚动而滚动

fixed：背景固定不动，不受内容滚动影响

直接上代码，哇哈哈哈 ~ ~

<style>

    .txt{

        width: 100%;

        height: 1000px;

        text-align:center;

    }

    .bg1, .bg2, .bg3, .bg4{

        width: 100%;

        height: 400px;

        background-size: cover;

        background-attachment: fixed;

        text-align: center;

        color: #fff;

        background-position: center center;

        background-repeat: no-repeat;

    }

    .bg1{ background-image: url(https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1536819591022&di=fcf314d0fbb32a96d67dc015ee642734&imgtype=0&src=http%3A%2F%2Fold.bz55.com%2Fuploads%2Fallimg%2F141218%2F139-14121Q05415.jpg); }

    .bg2{ background-image: url(https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1536819612013&di=5c21265ec22ca18b9f97459b0ffb5989&imgtype=0&src=http%3A%2F%2Fpic1.win4000.com%2Fwallpaper%2F6%2F5860a7fd794c2.jpg); }

    .bg3{ background-image: url(https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1536819626165&di=0e6a7e49f95c3030848ba38e6333a983&imgtype=0&src=http%3A%2F%2Fimg5q.duitang.com%2Fuploads%2Fitem%2F201312%2F27%2F20131227233228_tLBH3.jpeg); }

    .bg4{ background-image: url(https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1536819591022&di=fcf314d0fbb32a96d67dc015ee642734&imgtype=0&src=http%3A%2F%2Fold.bz55.com%2Fuploads%2Fallimg%2F141218%2F139-14121Q05415.jpg); }

</style>

<div class="txt">永远相信美好的事情即将发生</div>

<div class="bg1">原来就是这么简单哦</div>

<div class="txt">永远相信美好的事情即将发生</div>

<div class="bg2">原来就是这么简单哦</div>

<div class="txt">永远相信美好的事情即将发生</div>

<div class="bg3">原来就是这么简单哦</div>

<div class="txt">永远相信美好的事情即将发生</div>

<div class="bg3">原来就是这么简单哦</div>