Web Front-endCSS TutorialThe difference between background images and inserted images in css and the sample code for using sprite imagesThe difference between background images and inserted images in css and the sample code for using sprite images
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="/static/imghwm/default1.png" data-src="images/image.png" class="lazy" 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>
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