Phantomjs page.content未检索页面内容

时间:2014-10-15 11:59:44

标签: javascript html ajax web-scraping phantomjs

我使用Phantomjs来抓取使用JavaScript和Ajax加载动态内容的网站 我有以下代码:

  var page = require('webpage').create();
        page.onError = function(msg, trace) {
            var msgStack = ['ERROR: ' + msg];
            if (trace && trace.length) {
                msgStack.push('TRACE:');
                trace.forEach(function(t) {
                    msgStack.push(' -> ' + t.file + ': ' + t.line + (t.function ? ' (in function "' + t.function +'")' : ''));
                });
            }
            console.error(msgStack.join('\n'));
        };
        page.onConsoleMessage = function(msg, lineNum, sourceId) {
            console.log('CONSOLE: ' + msg + ' (from line #' + lineNum + ' in "' + sourceId + '")');
        };
        page.open('http://www.betexplorer.com/soccer/germany/oberliga-bayern-sud/wolfratshausen-unterhaching-ii/x8rBMAB8/', function () {
            console.log(page.content);
            phantom.exit();
        });   

问题是此代码无法检索我想要的源代码 如果您通过Web浏览器(如chrome)输入URL并阅读页面的源代码(动态源代码,在进行JavaScript和Ajax调用之后),您将看到Web浏览器源代码和Phantomjs源代码代码完全不同。
但在这种情况下我需要Web浏览器源代码 通常这个Phantomjs代码检索我需要的源代码,但是对于这个url(任何其他的),Phantomjs不会检索正确的源代码。
我假设Phantomjs不知道如何处理将动态内容加载到此页面的JavaScript和Ajax调用 我在运行代码时遇到这些错误:

ERROR: TypeError: 'undefined' is not a function (evaluating 'function(e){
        this.pointer.x = e.pageX;
        this.pointer.y = e.pageY;
    }.bind(this)')
TRACE:
 -> http://www.betexplorer.com/gres/tooltip.js?serial=1410131213: 207
 -> http://www.betexplorer.com/gres/tooltip.js?serial=1410131213: 157
 -> http://www.betexplorer.com/gres/tooltip.js?serial=1410131213: 310 (in function "tooltip")
 -> http://www.betexplorer.com/soccer/germany/oberliga-bayern-sud/wolfratshausen-unterhaching-ii/x8rBMAB8/: 291
 -> http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js: 2
 -> http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js: 2
 -> http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js: 2
 -> http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js: 2
CONSOLE: Invalid App Id: Must be a number or numeric string representing the application id. (from line #undefined in "undefined")
CONSOLE: FB.getLoginStatus() called before calling FB.init(). (from line #undefined in "undefined") 

那么如何使用Phantomjs获取此页面的动态源代码(http://www.betexplorer.com/soccer/germany/oberliga-bayern-sud/wolfratshausen-unterhaching-ii/x8rBMAB8/)?

1 个答案:

答案 0 :(得分:3)

由于页面是动态生成的,因此您需要等待一段时间才能访问目标页面源。

page.open('http://www.betexplorer.com/soccer/germany/oberliga-bayern-sud/wolfratshausen-unterhaching-ii/x8rBMAB8/', function () {
    setTimeout(function(){
        console.log(page.content);
        phantom.exit();
    }, 5000); // 5 sec should be enough
});

TypeError: 'undefined' is not a function是指bind,因为PhantomJS 1.x不支持它。 PhantomJS 1.x使用QtWebkit的旧分支,可与Chrome 13或Safari 5相媲美。较新的PhantomJS 2使用支持bind的新引擎。如果您仍然使用版本1.x,则需要在page.onInitialized事件处理程序中添加垫片:

page.onInitialized = function(){
    page.evaluate(function(){
        var isFunction = function(o) {
          return typeof o == 'function';
        };

        var bind,
          slice = [].slice,
          proto = Function.prototype,
          featureMap;

        featureMap = {
          'function-bind': 'bind'
        };

        function has(feature) {
          var prop = featureMap[feature];
          return isFunction(proto[prop]);
        }

        // check for missing features
        if (!has('function-bind')) {
          // adapted from Mozilla Developer Network example at
          // https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Function/bind
          bind = function bind(obj) {
            var args = slice.call(arguments, 1),
              self = this,
              nop = function() {
              },
              bound = function() {
                return self.apply(this instanceof nop ? this : (obj || {}), args.concat(slice.call(arguments)));
              };
            nop.prototype = this.prototype || {}; // Firefox cries sometimes if prototype is undefined
            bound.prototype = new nop();
            return bound;
          };
          proto.bind = bind;
        }
    });
};

取自我的回答here