vim记住上次编辑和浏览位置

"remember last update or view postion"
" Only do this part when compiled with support for autocommands
if has("autocmd")
" In text files, always limit the width of text to 78 characters
autocmd BufRead *.txt set tw=78
" When editing a file, always jump to the last cursor position
autocmd BufReadPost *
\ if line("'\"") > 0 && line ("'\"") <= line("$") |
\ exe "normal g'\"" |
\ endif
endif