jquery implements greater than or equal to and less than equals-ground tornado

Do the functions of merging cells as shown in

　　

To achieve this, you need to first obtain a TR that includes the starting and ending rows.
$ ("Tr:eq (" +index_starttr+ "), Tr:gt (" +index_starttr+ "): Lt (" + (index_endtr-index_starttr) + ")", "#demo")

The EQ GT LT Index is all starting from 0
EQ equals
, merge the selected results
GT (0) Select all indexes greater than 0 elements

LT (1) Select all elements down to 1

* Back: LT ("+ (index_endtr-index_starttr) +") "is screened on the basis of the front GT selection set
If you do not subtract index_starttr it will result in multiple selections.

Tips:

In another one months, we can not get the formal interview notice, go home.

jquery implements greater than or equal to and less than equals-ground tornado