Question

enter code here我正在尝试从网站中提取内容以用于学习目的。我使用了YQL，它给了我JSON（https://developer.yahoo.com/yql/）。我以为我正在取得进展但不幸的是我无法通过NPM模块获得相同的输出。以下是我的代码：

var YQL = require('yql');
new YQL.exec('select * from html where url="http://www.natnlawcenter.com/United-States-Car-Dealerships/Alabama.aspx" ', function(response) {
  console.log(response);
});

以下是我的输出：

{ query: 
   { count: 1,
     created: '2015-09-27T23:51:25Z',
     lang: 'en-US',
     results: { body: [Object] } } }

如何访问正文内容：[对象]？

感谢您的时间。

我修改了以下代码：

request({
    method: 'GET',
    url: 'http://www.natlawcenter.com/United-States-Car-Dealerships/Alabama.aspx'
}, function(err, response, body) {
    if (err) return console.error(err);
    // Tell Cherrio to load the HTML
     $ = cheerio.load(body);
    console.log($('td').each(function(i, element){
      var a = $(this);
      console.log(a);
    }));
});

以下是我的输出：

{ options: 
   { withDomLvl1: true,
     normalizeWhitespace: false,
     xmlMode: false,
     decodeEntities: true },
  _root: 
   { '0': 
      { type: 'root',
        name: 'root',
        attribs: {},
        children: [Object],
        next: null,
        prev: null,
        parent: null },
     options: 
      { withDomLvl1: true,
        normalizeWhitespace: false,
        xmlMode: false,
        decodeEntities: true },
     length: 1,
     _root: [Circular] },
  length: 0,
  prevObject: 
   { options: 
      { withDomLvl1: true,
        normalizeWhitespace: false,
        xmlMode: false,
        decodeEntities: true },
     _root: { '0': [Object], options: [Object], length: 1, _root: [Circular] },
     length: 0,
     prevObject: { '0': [Object], options: [Object], length: 1, _root: [Circular] } } }
[Function]
[Function]
[Function]
[Function]
[Function]
{ '0': 
   { type: 'tag',
     name: 'td',
     attribs: { valign: 'top', width: '999' },
     children: [ [Object], [Object] ],
     next: 
      { data: '\r\n\t\t\t\t\t\t\t\t',
        type: 'text',
        next: null,
        prev: [Circular],
        parent: [Object] },
     prev: 
      { data: '\r\n\t\t\t',
        type: 'text',
        next: [Circular],
        prev: null,
        parent: [Object] },
     parent: 
      { type: 'tag',
        name: 'tr',
        attribs: {},
        children: [Object],
        next: [Object],
        prev: [Object],
        parent: [Object] } },
-------------------------------
'188': 
   { type: 'tag',
     name: 'td',
     attribs: { width: '25%', icobalt: 'System.Web.UI.ITemplate' },
     children: 
      [ [Object],
        [Object],
        [Object],
        [Object],
        [Object],
        [Object],
        [Object],
        [Object],
        [Object],
        [Object],
        [Object],
        [Object],
        [Object],
        [Object],
        [Object],
        [Object] ],
     next: 
      { type: 'tag',
        name: 'td',
        attribs: [Object],
        children: [Object],
        next: [Object],
        prev: [Circular],
        parent: [Object] },
     prev: 
      { type: 'tag',
        name: 'tr',
        attribs: [Object],
        children: [Object],
        next: [Circular],
        prev: [Object],
        parent: [Object] },
     parent: 
      { type: 'tag',
        name: 'tbody',
        attribs: {},
        children: [Object],
        next: null,
        prev: null,
        parent: [Object] } },

如何访问例如'188'的儿童对象中的什么？

感谢您的时间。

Answer 1

您需要使用JSON.parse()将 JSON 响应解析为 JS 对象。您的代码可以像我们一样重写 -

request({
    method: 'GET',
    url: 'http://www.natlawcenter.com/United-States-Car-Dealerships/Alabama.aspx'
}, function(err, response, body) {
    if (err) return console.error(err);

    if (response.statusCode === 200 && body) return JSON.parse(body);
});

在Node JS中使用YQL

1 个答案: