有可能有宽度为100％的表(所以表适合屏幕尺寸),其中第一列和最后一列具有固定的宽度,而其余的列之间的列都为50％.
喜欢：
+--------------------+--------------------------------------+--------------------------------------+------------+ | width:300px; | with dynamic,equals next column | width dynamic,equals prevous column | width:50px;| +--------------------+--------------------------------------+--------------------------------------+------------+ +--------------------+--------------------------------------+--------------------------------------+------------+ +--------------------+--------------------------------------+--------------------------------------+------------+ +--------------------+--------------------------------------+--------------------------------------+------------+
