html:
代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<link rel="stylesheet" href="../css/reset.css">
<link rel="stylesheet" href="../css/91背景练习.css">
</head>
<body>
<div class="box1"></div>
</body>
</html>
css:
(1)当浏览器第一次加载图片时,在一些图片出现特效时,会有一些闪烁现象,为了解决这种问题,采用把图片集合为一张图片,然后通过background-position:;来移动图片;
(2)此种方法被称为雪碧图
(3)装图片时,要设定好宽高,正好装下图片
代码:
.box1 {
width: 93px;
height: 29px;
background-image: url('../img/btn.png');
}
.box1:link {
background-image: url('../img/btn.png');
}
.box1:hover {
background-image: url('../img/btn.png');
background-position: -93px 0;
}
.box1:active {
background-image: url('../img/btn.png');
background-position: -186px 0;
}