ExtJS的Grid中的文本如何能够选择并复制到剪粘板
参考自 http://www.sencha.com/learn/grid-faq,
How to select text in the grid (with the mouse) so that it can be copied to the clipboard

First, add an extra CSS rule:

我用的是ExtJS3.4，在IE8，Firefox11,Chrome18下均测试通过。