Table header category grouping effect, table Category grouping

Table header category grouping effect, table Category grouping

Table header category grouping effect:
Tables are used to organize data very conveniently. For example, data can be organized according to the data category or in other ways. Sometimes the classification is complex. For example, a large category also contains a small classification, the following is a similar code example, hoping to help friends who need it.
The Code is as follows:

<! DOCTYPE html> 
Original address: http://www.51texiao.cn/HTML5jiaocheng/2015/0612/4009.html