http://search.jd.com/Search?keyword=Python&enc=utf-8&book=y&wq=Python&pvid=33xo9lni.p4a1qb

var configs = {  domains: ["search.jd.com","item.jd.com","club.jd.com"],  scanUrls: ["http://search.jd.com/Search?keyword=Python&enc=utf-8&qrst=1&rt=1&stop=1&book=y&vt=2&page=1&s=1&click=0"],  contentUrlRegexes: ["http://item\\.jd\\.com/\\d+.html"],  helperUrlRegexes: ["http://search\\.jd\\.com/Search\\?keyword=Python&enc=utf-8&qrst=1&rt=1&stop=1&book=y&vt=2&page=\\d+&s=1&click=0"],//可留空
    fields: [  {  // 第一个抽取项  name: "title",  selector: "//div[@id='name']/h1",//默认使用XPath  required: true //是否不能为空
        },  {  // 第一个抽取项  name: "productid",  selector: "//div[contains(@class,'fl')]/span[2]",//默认使用XPath  required: true //是否不能为空
        },  {  name: "comments",  sourceType: SourceType.AttachedUrl,  attachedUrl: "http://club.jd.com/productpage/p-{productid}-s-0-t-3-p-0.html",  selectorType: SelectorType.JsonPath,  selector: "$.comments",  repeated: true,  children:[  {  name: "com_content",  selectorType: SelectorType.JsonPath,  selector: "$.content"  },  {  name: "com_nickname",  selectorType: SelectorType.JsonPath,  selector: "$.nickname"  },  ]  }  ]
};
configs.onProcessHelperUrl = function(url, content, site){  if(!content.indexOf("抱歉，没有找到")){  var currentPage = parseInt(url.substring(url.indexOf("&page=") + 6));  if(currentPage == 0){  currentPage = 1;  }  var page = currentPage + 2;  var nextUrl = url.replace("&page=" + currentPage, "&page=" + page);  site.addUrl(nextUrl);  }  return true;
};
var crawler = new Crawler(configs);
crawler.start();  

configs.enableProxy = true;