Install Nodejs

1. Window OS

download nodejs from https://nodejs.org/

 

2. 下载安装好之后直接cmd

 

3. 输入.help， 可看到如下结果

> .help
break   Sometimes you get stuck, this gets you out
clear   Alias for .break
exit    Exit the repl
help    Show repl options
load    Load JS from a file into the REPL session
save    Save all evaluated commands in this REPL session to a file

说明安装成功