浏览器的默认链接颜色是蓝色，所以用户比较期望它。
The browser's default link color is blue, so people expect it.
还支持采用不同颜色的双线显示的错误链接。
Fault links are supported as well, shown with double-lines in a different color.
使用超链接颜色，下划线或者排序图标来让用户认识到该表头是提供排序功能的。
Use a link color, underline, or sort ICONS to communicate that column headers are sortable.
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