background-image:url(img/img1.jpg); 定义图像文件位置
background-position:center; 定义图像居中位置
background-repeat:no-repeat; 定义图像不重复显示
background-size:cover; 定义图像完全覆盖区域
background-attachment:fixed; 定义图像视口大小。
实例代码：
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<style>
html{
background-image:url(img/img1.jpg);
background-position:center;
background-repeat:no-repeat;
background-size:cover;
background-attachment:fixed;
}
body{
color:white;
}
</style>
</head>
<body>
<h1>完整页面的背景图像</h1>
<p>Shanghai is one of the four direct-administered municipalities of the People's Republic of China. Welcome to Shanghai! The city is located on the southern estuary of the Yangtze, with the Huangpu River flowing through it.</p>
</body>
</html>运行效果：
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