当链接被选中时，要能有相应的反馈，比如改变字体颜色、增加下划线、改变背景色等等，即使这个链接是附在图片上的。
When the link is selected, instead of just underlining it or changing its color, it should change the background color, even if the link is in the middle of a paragraph.
当一个方法被选中(单击)，它就展开并显示父子节点，背景色为紫色的是父节点，背景色为黄色的是子节点。
When a method is selected (by clicking on it), it expands to show the parents and children. Parents are shown with a purple background and children with a yellow background.
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