acts_as插件架构具有一个定位点：acts_as宏。
The acts_as plug-in architecture has one anchor point: the acts_as macro.
所有的定位点元素文本都有一个不同的蓝色阴影，这取决于链接是否访问过。
All anchor element text will have a different shade of blue depending whether the link was visited or not.
更加有效的就是将响应的错误消息链接到出错字段的一个页面定位点处，并将将焦点设置为该字段，如清单2所示。
Even more effective is to link the respective error message to a page anchor located at the field in error and set the focus to that field, as shown in Listing 2.
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