NSIndexPath *path=[NSIndexPath indexPathForRow:row inSection:0];
JSBubbleMessageCell *cell = (JSBubbleMessageCell *)[_tableView cellForRowAtIndexPath:path];
NSIndexPath *path=[NSIndexPath indexPathForRow:row inSection:0];
JSBubbleMessageCell *cell = (JSBubbleMessageCell *)[_tableView cellForRowAtIndexPath:path];