用命令`
node --v8-options | grep harmony查看nodejs实现es6的新特性，输出结果是
output is not tty
git bash的问题The reason this doesn’t work as expected appears to be that git bash is passing the command through to the Windows cmd shell, and not handling the output stream correctly
参考
可以在power shell里面运行node --v8-options | Select-String "harmony"