主要代码：
<link rel="icon" href="${ctx}/img/car.jpg" type="image/x-icon"/>
示例：
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <link rel="icon" href="img/car.jpg" type="image/x-icon"/> </head> <body> 网页头部图标 </body> </html>
