emacs总结
快捷键显示方式用法：
- “C-x”表示按住control的同是按住x键
- “M-x”表示按住alt的同时按住x键（Mac上没有用）/按一下esc再按一下x
快捷键总结：
- C-g: quit
- C-x C-c: exit
- C-x C-f: opne a file
- C-x C-s: save file
- C-f/C-b: move forword/back a character
- M-f/M-b: move forword/back a word
- C-d/M-d: delete a character/word
- C-_: undo
- C-p/C-n: Move up/Down to the previous line
- C-a/C-e: Move to the beginning/end line
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