最近在使用ExtJS搭建网页界面过程中报出错误消息，IE中的提示如下：
例外被抛出且未被接住，行19。。。。
Firefox提示如下：
uncaught exception: No center region defined in BorderLayout westpanel.
根据IE的错误信息调试了老半天也没找到哪的毛病，本来就没多少的JS代码，硬是不知道问题出在哪。看了Firefox的提示才明白，意思就是说在layout为border的westpanel中没有定义center region。防止这样的报错就得把layout为border删了或者添加center region，显然如果这个panel没有子panel(items)的话完全没必要设成border layout。查了下ExtJS3.1.1 API documentation，关于border layout的提示有：
1.Any container using the BorderLayout must have a child item with region:’center’. The child item in the center region will always be resized to fill the remaining space not used by the other regions in the layout.
2.Any child items with a region of west or east must have width defined (an integer representing the number of pixels that the region should take up).
3.Any child items with a region of north or south must have height defined.
原来已经说得很清楚了，只是用得时候没注意啊。
以后调试还是得多用Firefox的Firebug了。
文章源自：烈火网，原文：/a/view/30748.html
