css之雪碧图（精灵图）

听到雪碧图是不是跟我一样，啥？雪碧图？不知所以。

如果一张大图由许多小图构成，那么每张小图都需要进行网络请求，这样一来就会有很多请求，为了减少网络请求，雪碧图就出现了。

雪碧图（Sprite）是一种在Web开发中常用的图像合并技术，将多个小图标或图片合并成一张大图，然后通过CSS来显示其不同部分。这种技术可以减少HTTP请求数量，提高网页加载速度。

以下是本人自己写的例子，大图的图片是在百度找的https://img2.baidu.com/it/u=2480900908,627122939&fm=253&fmt=auto&app=138&f=JPEG?w=602&h=231

原图长这样

代码运行长这样：

代码如下：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div{
            display: flex;
        }
        .icon1{
            display: block;
            background-image: url("@/../xuebitu.jpg");
            width:50px;
            height:55px;
            background-position: -5px 1px;
            /* border: 1px solid #000; */
        }

        .icon2{
            display: block;
            background-image: url("@/../xuebitu.jpg");
            width:50px;
            height:55px;
            background-position: -95px 1px;
        }
        .icon3{
            display: block;
            background-image: url("@/../xuebitu.jpg");
            width:50px;
            height:55px;
            background-position: -185px 1px;
        }
        .icon4{
            display: block;
            background-image: url("@/../xuebitu.jpg");
            width:50px;
            height:55px;
            background-position: -275px 1px;
        }
        .icon5{
            display: block;
            background-image: url("@/../xuebitu.jpg");
            width:50px;
            height:55px;
            background-position: -365px 1px;
        }
        .icon6{
            display: block;
            background-image: url("@/../xuebitu.jpg");
            width:50px;
            height:55px;
            background-position: -455px 1px;
        }
        .icon7{
            display: block;
            background-image: url("@/../xuebitu.jpg");
            width:50px;
            height:55px;
            background-position: -545px 1px;
        }
        .icon2-1{
            display: block;
            background-image: url("@/../xuebitu.jpg");
            width:50px;
            height:55px;
            background-position: -5px -90px;
        }
        .icon2-2{
            display: block;
            background-image: url("@/../xuebitu.jpg");
            width:50px;
            height:55px;
            background-position: -95px -90px;
        }
        .icon2-3{
            display: block;
            background-image: url("@/../xuebitu.jpg");
            width:50px;
            height:55px;
            background-position: -185px -90px;
        }
        .icon2-4{
            display: block;
            background-image: url("@/../xuebitu.jpg");
            width:50px;
            height:55px;
            background-position: -275px -90px;
        }
        .icon2-5{
            display: block;
            background-image: url("@/../xuebitu.jpg");
            width:50px;
            height:55px;
            background-position: -365px -90px;
        }
        .icon2-6{
            display: block;
            background-image: url("@/../xuebitu.jpg");
            width:50px;
            height:55px;
            background-position: -455px -90px;
        }
        .icon2-7{
            display: block;
            background-image: url("@/../xuebitu.jpg");
            width:50px;
            height:55px;
            background-position: -545px -90px;
        }
        .icon3-1{
            display: block;
            background-image: url("@/../xuebitu.jpg");
            width:50px;
            height:55px;
            background-position: -5px -179px;
        }
        .icon3-2{
            display: block;
            background-image: url("@/../xuebitu.jpg");
            width:50px;
            height:55px;
            background-position: -95px -179px;
        }
        .icon3-3{
            display: block;
            background-image: url("@/../xuebitu.jpg");
            width:50px;
            height:55px;
            background-position: -185px -179px;
        }
        .icon3-4{
            display: block;
            background-image: url("@/../xuebitu.jpg");
            width:50px;
            height:55px;
            background-position: -275px -179px;
        }
        .icon3-5{
            display: block;
            background-image: url("@/../xuebitu.jpg");
            width:50px;
            height:55px;
            background-position: -365px -179px;
        }
        .icon3-6{
            display: block;
            background-image: url("@/../xuebitu.jpg");
            width:50px;
            height:55px;
            background-position: -455px -179px;
        }
        .icon3-7{
            display: block;
            background-image: url("@/../xuebitu.jpg");
            width:50px;
            height:55px;
            background-position: -545px -179px;
        }
    </style>
</head>
<body> 
    <div>
        <span class="icon1"></span>
        <span class="icon2"></span>
        <span class="icon3"></span>
        <span class="icon4"></span>
        <span class="icon5"></span>
        <span class="icon6"></span>
        <span class="icon7"></span>
    </div>
    <div>
        <span class="icon2-1"></span>
        <span class="icon2-2"></span>
        <span class="icon2-3"></span>
        <span class="icon2-4"></span>
        <span class="icon2-5"></span>
        <span class="icon2-6"></span>
        <span class="icon2-7"></span>
    </div>
    <div>
        <span class="icon3-1"></span>
        <span class="icon3-2"></span>
        <span class="icon3-3"></span>
        <span class="icon3-4"></span>
        <span class="icon3-5"></span>
        <span class="icon3-6"></span>
        <span class="icon3-7"></span>
    </div>
    <!-- <span class="icon2"></span> -->
</body>
</html>