参考：http://stackoverflow.com/questions/15884102/bootstrap-how-do-i-change-the-width-of-the-container
怎么更改contianer 的width？
这样.container{ width:xxx;}
就可以了吗？
错。that will break everything, since each span class has a fixed width which is calculated in relation to thecontainer width.所有我们必须重新计算span1-span12的width。
解决办法：
假设我们想设置widht为1000px.去
Go to the Customize section on Bootstrap site and choose the size you prefer. You'll have to set@gridColumnWidth and @gridGutterWidth variables.
For example: @gridColumnWidth = 65px and @gridGutterWidth = 20px results on a 1000pxlayout.
Then download it.
是怎么计算的？
12*(gridColumnWidth+gridGutterWidth)-gridGutterWidth=your width.
Theoretically, there are infinite combinations that match 1000px. An example: 12*65 + 11*20 = 1000 (there are only 11 gutters between columns).