1npm  install
2npm run dev
3TypeError [ERR_INVALID_CALLBACK]: Callback must be a function
     build/webpack.dev.config.js滻
	fs.write(fd, buf, 0, buf.length, 0, function(err, written, buffer) {});
           =>fs.write(fd, buf, 0, 'utf-8', function(err, written, buffer) {});
     ִnpm run dev