docs: function execCode(code, options) {
      let local = { exports: {} },
          filename = options.filename,
          script = new vm.Script(format(code), { filename });
  
      // 执行代码
      script.runInNewContext({
          process,
          module: local,
          exports: local.exports,
          __MODULE_LOADER__: options.load,
          __MODULE_RESOLVE__: options.resolve,
          __dirname: options.context,
          __filename: filename
      });
  
      // 返回结果
      return local.deferred().then(() => local.exports);
  }