Javascript Node.js/Amazon产品API

我正在玩，但不确定如何调用opHelper.execute函数：

var util = require('util'),
  OperationHelper = require('apac').OperationHelper;

var opHelper = new OperationHelper({
  awsId:     '[YOUR AWS ID HERE]',
  awsSecret: '[YOUR AWS SECRET HERE]',
  assocId:   '[YOUR ASSOCIATE TAG HERE]'
  // xml2jsOptions: an extra, optional, parameter for if you want to pass additional options for the xml2js module. (see https://github.com/Leonidas-from-XIV/node-xml2js#options)
});

opHelper.execute('ItemSearch', {
  'SearchIndex': 'Books',
  'Keywords': 'harry potter',
  'ResponseGroup': 'ItemAttributes,Offers'
}, function(err, results) { // you can add a third parameter for the raw xml response, "results" here are currently parsed using xml2js
  console.log(results);
});

如果我只是想要一个按钮来显示点击时的结果，我该怎么做

<button onclick = "execute()">

---

我完全迷路了

节点apac是一个节点模块，用于服务器端代码。您需要以某种方式托管http服务器，并将其返回给客户端。从一个快速的js教程开始，我明白了。好的，非常感谢！