javascript - 为什么我用phantomjs抓取页面，如果页面数据多就抓取不到？

我想抓取一个爱淘宝的搜索页面，它是有js渲染生成的页面，所以我选择用phantomjs抓取。但是在抓取过程中出现一个问题。当搜索结果超过两个的时候，就获取不到数据。但是截图显示数据加载正常。不知道是淘宝做了限制还是我代码出了问题，求大神帮忙解决一下。

var url = "https://ai.m.taobao.com/search.html?q=%E5%90%8D%E4%BA%BA%E7%91%9E%E8%A3%B32017%E5%A4%8F%E8%A3%85%E6%96%B0%E6%AC%BE%E5%A5%B3%E8%A3%85%E8%A3%99%E5%AD%90%E5%8F%8A%E8%86%9D%E9%95%BF%E6%AC%BE%E4%BF%AE%E8%BA%AB%E5%81%87%E4%B8%A4%E4%BB%B6%E5%8D%B0%E8%8A%B1%E9%9B%AA%E7%BA%BA%E8%BF%9E%E8%A1%A3%E8%A3%99&spm=a311n.7676424.1000.1&prepvid=201_10.184.72.34_159920160034_1496243285841&pid=mm_33231688_7050284_23466709&env&unid&hidebar&isout&clk1&smart&rb";
var page =require('webpage').create();
var fs = require('fs');
page.settings = {
  javascriptEnabled: true,
  loadImages: false,
  webSecurityEnabled: false,
  userAgent: 'Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1847.137 Safari/537.36 LBBROWSER'
};
page.open(url,function (status) {
    if (status !== 'success') {
        console.log('Unable to access thewebsite');
    } else {
             window.setTimeout(function () {
                page.render('example1.png');
                var val = page.evaluate(function(){
                    var data = document.querySelectorAll('p.item-thumbnail a.item-intro');
                    if ( data instanceof Array ) {  
                       return 1;
                        console.log(1)
                        for (var i = 0, len = data.length; i < len; i++) {  
                           console.log(data[i].innerHTML);  
                        }  
                    } else if ( data instanceof Object ) {  
                       var description = ""; 
                       for (var i in data) {  
                          description += i + " = " + data[i] + "\n";  
                      } 
                      return description;
                           // console.log(nextSibling(data).innerHTML);  
                    }  else {
                      return data;
                    } 
                });
                console.log('The register address:' + val);
                phantom.exit();
          }, 1000); 
            
         };
});