'NPM' is not an internal or external command, nor is it a runnable program or batch file

problem ：       

         Installed node.js after , Use npm --version May prompt ‘npm’ Not an internal or external command , It's not a runnable program Or batch files .
reason ： May be environment variable Not configured properly

1、 stay “ This computer ” Right click in and click Properties

2、 After entering the system, click “ Advanced system setup ” Environment variables in

3、 Find... In the system variable Path, Click to enter Path

4、 see node.exe The address of （ Blue place ）

5、 Add... At the end node.exe The address of , Then click OK

 6、 stay cmd Input npm-v View version information

If the version information is output, the configuration is successful ！