/*对于C风格的注释可以使用如下命令*/
:%s/\_s*\/\*\(\S\|\_s\)\{-}\*\///g
//对于C++风格注释
:%s/\/\/.*//g
/*...*/ -> //... (仅限单行)
:%s/\/\*\(\(\S\|\_s\)\{-}\)\*\//\/\/\1/g
//... -> /*...*/(仅限单行)
:%s/\/\/\(.*\)/\/\*\1\*\//g