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<meta name="description" content="前言之前写的爬虫都是直接获取网页内容，解析保存需求数据。然而我后来又遇到一些网页数据使用Ajax获取的，数据不存在于网页的源代码。(高手大神请无视我的见识浅薄) 后来经过学习，终于搞明白这类的网页怎么抓去信息。废话不多说，我们就以马蜂窝为例，做一个简单爬虫。
目标马蜂窝爬取北京的热门景点。
具体流程编写代码前，先来到这个网页 http://www.mafengwo.cn/jd/10065/gong">
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目标马蜂窝爬取北京的热门景点。
具体流程编写代码前，先来到这个网页 http://www.mafengwo.cn/jd/10065/gong">
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目标马蜂窝爬取北京的热门景点。
具体流程编写代码前，先来到这个网页 http://www.mafengwo.cn/jd/10065/gong">
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node.js写马蜂窝爬虫 有关ajax
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<h3 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h3><p>之前写的爬虫都是直接获取网页内容，解析保存需求数据。然而我后来又遇到一些网页数据使用Ajax获取的，数据不存在于网页的源代码。(高手大神请无视我的见识浅薄) 后来经过学习，终于搞明白这类的网页怎么抓去信息。废话不多说，我们就以马蜂窝为例，做一个简单爬虫。</p>
<h3 id="目标"><a href="#目标" class="headerlink" title="目标"></a>目标</h3><p>马蜂窝爬取北京的热门景点。</p>
<h3 id="具体流程"><a href="#具体流程" class="headerlink" title="具体流程"></a>具体流程</h3><p>编写代码前，先来到这个网页 <a href="http://www.mafengwo.cn/jd/10065/gonglve.html" title="马蜂窝北京景点页面" target="_blank" rel="external">http://www.mafengwo.cn/jd/10065/gonglve.html</a> 最下面北京全部景点模块。<br><img src="/upload/beijingimg.png" alt=""><br>打开chrome inspect under network 是这样的<br><img src="/upload/beijingimg2.png" alt=""><br>看到这里就可以开始写代码了 </p>
<h3 id="核心代码"><a href="#核心代码" class="headerlink" title="核心代码"></a>核心代码</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div></pre></td><td class="code"><pre><div class="line">attractionsList = function(i,cityname){</div><div class="line"></div><div class="line"> superagent</div><div class="line"> .post('http://www.mafengwo.cn/ajax/router.php')</div><div class="line"> .type('form')</div><div class="line"> .send({</div><div class="line"> 'sAct':'KMdd_StructWebAjax|GetPoisByTag',</div><div class="line"> 'iMddid':10065,</div><div class="line"> 'iTagId':0,</div><div class="line"> 'iPage':i,</div><div class="line"> })</div><div class="line"> .set('User-Agent', 'Mozilla/5.0')</div><div class="line"> .end(function(err, res){</div><div class="line"> </div><div class="line"> var jsonstring = JSON.parse(res.text);</div><div class="line"> var $ = cheerio.load(jsonstring.data.list) </div><div class="line"></div><div class="line"> $('li').each(function(){</div><div class="line"></div><div class="line"> var data = $(this);</div><div class="line"> var href = data.find('a').attr('href');</div><div class="line"> var title = data.find('a').attr('title');</div><div class="line"></div><div class="line"> superagent.get('http://www.mafengwo.cn'+href) </div><div class="line"> .end(function(err,docs){ </div><div class="line"> if(!err){</div><div class="line"> var $ = cheerio.load(docs.text) </div><div class="line"> var summary = $('div.summary').text()</div><div class="line"> console.log(title);</div><div class="line"> console.log(summary);</div><div class="line"> }</div><div class="line"> })</div><div class="line"></div><div class="line"> })</div><div class="line"></div><div class="line"> var $$ = cheerio.load(jsonstring.data.page);</div><div class="line"> if ($$('a.pi.pg-next').length) {</div><div class="line"> getList(i+1,cityname)</div><div class="line"> }; </div><div class="line"> });</div><div class="line">}</div></pre></td></tr></table></figure>
<p>这段代码是获取景点列表后，去景点的详细界面获取景点简介。需要注意的是，爬马蜂窝并发的线程不能太多，否则会被封ip，哈哈。</p>
<h4 id="交友"><a href="#交友" class="headerlink" title="交友"></a>交友</h4><p>对互联网技术 机器学习 电影 热门游戏 及其它感兴趣的小伙伴可以加我微信好友。大家一起进步，哈哈。<br><img src="/upload/myqr.jpg" alt=""> </p>
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