rowspan跨行是table的一个很正常的需求，而tr的hover效果更是普遍。但既有rowspan又需要行的hover效果时，往往看到的就是这样：
简直不能忍！！
前几天碰到这问题时，我本打算写些JS代码来解决，但写起来比较复杂，虽然后面我想到了一种相对简单的思路，但需要html本身可控（就是html啥样可以由你决定），不适合大部分情况。
后来我觉得，这样一个显著的问题，不可能前人没有碰到过。于是用Google搜索之，果然。
解决思路很简单，我甚至不需要给大家列举代码，只口述即可。
table中支持多个tbody！这是实现跨行hover效果的关键，所以我们的解决办法是：把rowspan的多个相关行，用一个tbody包起来，然后设置tbody:hover的效果即可。
甚至以前的tr:hover效果你可以不管，只给相应tbody加上相同hover效果即可。
目测连IE7都兼容
所以，养成自觉加thead/tbody的习惯是不错的。-完-
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