免费版功能说明： ①免费版的组件最多只能开设五十个站点 ②开设站点时只能绑定一个主机头 ③没有修改和删除站点的功能 -Free Function: ① free version of the component can only open up to fifty sites ② can only bind a host header when the site opened ③ no function modify and delete sites