machinecat520
/
zj-Exercise


			
				
					
						
						
							123456789101112131415161718192021222324252627282930313233343536373839
							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>按钮练习</title>
    <style>

        a:link{
            display: block;
            width: 93px;
            height: 29px;
            background-image: url('./images/link.png');
        }

        a:hover{
            background-image: url('./images/hover.png');
        }

        a:active{
            background-image: url('./images/active.png');
        }

        /* 
            图片属于网页中的外部资源，外部资源都需要浏览器单独发送请求加载，
                浏览器加载外部资源时是按需加载的，用则加载，不用则不加载
                像上边的练习，link会首先加载，而active会在指定状态触发时才会加载
                
        */

    </style>
</head>
<body>
    
    <a href="javascript:;"></a>

</body>
</html>