优化：规则匹配设置范围

rules: [
  {
      test: /\.js$/,
      exclude: '/node_modules/',   // 排除
      include: path.resolve('src'),  // 在这个范围内
      use: {
          loader: 'babel-loader',
          options: {
              presets: [
                  '@babel/preset-env',
                  '@babel/preset-react'
              ]
          }
      }
  }