b/s 404错误页样式 里面多大20多套404错误页的模板，动态的和静态的都有，风格多变，有兴趣的可以下载了解一下(B/s 404 error page style, there are more than 20 sets of 404 erroneous page templates, dynamic and static, styles are changeable, interested can download to understand.)