查看当前buffer的编码：M-x describe-coding-system按C-x <RET> r <TAB> 列出所有编码以指定编码重读当前buffer：C-x <RET> r utf-8，(revert-buffer-with-coding-system)改变当前buffer的编码：C-x <RET> f uft-8，(set-buffer-file-coding-system)
;; (set-keyboard-coding-system 'utf-8)
;; (set-clipboard-coding-system 'utf-8)
;; (set-terminal-coding-system 'utf-8)
;; (set-buffer-file-coding-system 'utf-8)
;; (set-selection-coding-system 'utf-8)
;; (modify-coding-system-alist 'process "*" 'utf-8)
;; (setq default-process-coding-system '(utf-8 . utf-8))
;; (setq-default pathname-coding-system 'utf-8)
