设置Windows系统中JDK（JAVA）、MinGW（GCC）、NASM三种编译器的系统环境变量。 本程序依据三种编译器安装目录的不同关键字自行区分设置。 复制可执行文件到编译器的安装目录下，右键以管理员身份运行即可。

最终版本：运行即生效，无需重启；已存在与当前目录不同的目录会自动修改。本人只会这三种语言，等以后学习别的语言，有必要再修改吧。-Setting Windows system JDK (JAVA), MinGW (GCC), NASM three kinds of compiler system environment variables. This procedure based on three kinds of compiler installation directory different keywords distinguish themselves set. Copy the executable file to the compiler installation directory, right to run as administrator.

The final version: Run takes effect without rebooting　and the current directory will automatically modify different directories already exist. I only three languages, so after learning other languages, it is necessary to amend it.