M-.
Find first definition of tag (find-tag). 查找第一个匹配的函数或结构
C-u M-.
Find next alternate definition of last tag specified.
C-u - M-.
Go back to previous tag found.
C-M-. pattern RET
Find a tag whose name matches pattern (find-tag-regexp).
C-u C-M-.
Find the next tag whose name matches the last pattern used.
C-x 4 . tag RET
Find first definition of tag, but display it in another window (find-tag-other-window).
C-x 5 . tag RET
Find first definition of tag, and create a new frame to select the buffer (find-tag-other-frame).
M-*
Pop back to where you previously invoked M-. and friends.