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The difference between background images and inserted images in css and the sample code for using sprite images

黄舟
黄舟Original
2017-07-26 14:22:072169browse


1. Background pictures and inserted pictures

<!DOCTYPE html><html lang="en"><head>
    <meta charset="UTF-8">
    <title>40-css背景图片和插入图片的区别.html</title>
    <style>
        p{            
        width: 200px;            
        height:200px;            
        background-color: red;        
        }
        .box1{            
        background-image: url("images/image.png");            
        background-repeat: no-repeat;            
        background-position: right bottom;        
        }
    </style>
    </head>
    <body>
    <!--
    1,背景图片和插入图片的区别?
    (1),背景图片仅仅是一个装饰,你不会占用位置,插入图片会占用位置
    (2),背景图片有定位属性,很方便的控制图片的位置,插入图片没有定位属性
    (3),插入图片的语义比背景图片的语义要强,所以在企业开发中你的图片如果从想让搜索引擎收录,那么推荐使用插入图片
-->
<p class="box1">我是一个文字</p>
<p class="box2">
    <img src="images/image.png" alt="">
    我是文字</p>
    </body>
    </html>

2. Use of sprite pictures

<!DOCTYPE html><html lang="en"><head>
    <meta charset="UTF-8">
    <title>42-css精灵图.html</title>
    <style>
        .box1{            
        width: 100px;            
        height: 100px;            
        background-image: url("images/bg.jpg");            
        background-position: -422px -190px;        
        }
    </style>
    </head>
    <body>
    <!--
    1,什么是css的精灵图?
    是一种图像的合成技术，说白了，就是在一张集成了好多张图片的大图片上根据background-position显示要显示的图片
    2,css精灵图的作用?
    可以减少请求的次数,降低服务器的压力
    3,如何使用css精灵图?
    css精灵图需要配合背景的图片和背景定位
-->
<p class="box1">
</p>
</body>
</html>

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