longdesc 属性指向一个包含描述信息的页面。
Your browser does not support iframes. The URL of the long description is:
Your browser does not support iframes.
The URL of the long description is:
上面的代码返回如下结果：The URL of the long description is:jb51.net
希望本文所述对大家的javascript程序设计有所帮助。
