page.viewportSize = { width: 1024, height: 800 };

例如：

phantomjs snapshot.js http://www.baidu.com

命令行傳參只能在PhantomJS開啟時進行傳參，在運行過程中就無能為力了。

標準輸出能從PhantomJS向NodeJS輸出數(shù)據(jù)，但卻沒法從NodeJS傳數(shù)據(jù)給PhantomJS。

不過測試中，標準輸出是這幾種方式傳輸最快的，在大量數(shù)據(jù)傳輸中應當考慮。

PhantomJS向NodeJS服務發(fā)出HTTP請求，然后NodeJS返回相應的數(shù)據(jù)。

這種方式很簡單，但是請求只能由PhantomJS發(fā)出。

值得注意的是PhantomJS 1.9.0支持Websocket了，不過可惜是hixie-76 Websocket，不過畢竟還是提供了一種NodeJS主動向PhantomJS通訊的方案了。

測試中，我們發(fā)現(xiàn)PhantomJS連上本地的Websocket服務居然需要1秒左右，暫時不考慮這種方法吧。

phantomjs-node成功將PhantomJS作為NodeJS的一個模塊來使用，但我們看看作者的原理解釋：

I will answer that question with a question. How do you communicate with a process that doesn't support shared memory, sockets, FIFOs, or standard input?

Well, there's one thing PhantomJS does support, and that's opening webpages. In fact, it's really good at opening web pages. So we communicate with PhantomJS by spinning up an instance of ExpressJS, opening Phantom in a subprocess, and pointing it at a special webpage that turns socket.io messages into alert()calls. Those alert() calls are picked up by Phantom and there you go!

The communication itself happens via James Halliday's fantastic dnode library, which fortunately works well enough when combined with browserify to run straight out of PhantomJS's pidgin Javascript environment.

實際上phantomjs-node使用的也是HTTP或者Websocket來進行通訊，不過其依賴龐大，我們只想做一個簡單的東西，暫時還是不考慮這個東東吧。

  if(!fs.existsSync('./snapshot')) {
    fs.mkdirSync('./snapshot');
  }

  if (cluster.isMaster) {
    cluster.fork();

    cluster.on('exit', function (worker) {
      console.log('Worker' + worker.id + ' died :(');
      process.nextTick(function () {
        cluster.fork();
      });
    })
  } else {
    require('./extract.js');
  }
})();

  var app = connect()
    .use(connect.logger('dev'))
    .use('/snapshot', connect.static(__dirname + '/snapshot', { maxAge: pkg.maxAge }))
    .use(connect.bodyParser())
    .use('/bridge', bridge)
    .use('/api', function (req, res, next) {
      if (req.method !== "POST" || !req.body.campaignId) return next();
      if (!req.body.urls || !req.body.urls.length) return jobMan.watch(req.body.campaignId, req, res, next);

      var campaignId = req.body.campaignId
        , imagesPath = './snapshot/' + campaignId + '/'
        , urls = []
        , url
        , imagePath;

      function _deal(id, url, imagePath) {
        // just push into urls list
        urls.push({
          id: id,
          url: url,
          imagePath: imagePath
        });
      }

      for (var i = req.body.urls.length; i--;) {
        url = req.body.urls[i];
        imagePath = imagesPath + i + '.png';
        _deal(i, url, imagePath);
      }

      jobMan.register(campaignId, urls, req, res, next);
      var snapshot = spawn('phantomjs', ['snapshot.js', campaignId]);
      snapshot.stdout.on('data', function (data) {
        console.log('stdout: ' + data);
      });
      snapshot.stderr.on('data', function (data) {
        console.log('stderr: ' + data);
      });
      snapshot.on('close', function (code) {
        console.log('snapshot exited with code ' + code);
      });

    })
    .use(connect.static(__dirname + '/html', { maxAge: pkg.maxAge }))
    .listen(pkg.port, function () { console.log('listen: ' + 'http://localhost:' + pkg.port); });

})();

  return function (req, res, next) {
      if (req.headers.secret !== pkg.secret) return next();
      // Snapshot APP can post url information
      if (req.method === "POST") {
        var body = JSON.parse(JSON.stringify(req.body));
        jobMan.fire(body);
        res.end('');
      // Snapshot APP can get the urls should extract
      } else {
        var urls = jobMan.getUrls(req.url.match(/campaignId=([^&]*)(\s|&|$)/)[1]);
        res.writeHead(200, {'Content-Type': 'application/json'});
        res.statuCode = 200;
        res.end(JSON.stringify({ urls: urls }));
      }
  };

})();

  function _send(campaignId){
    var job = _jobs[campaignId];
    if (!job) return;
    if (job.waiting) {
      job.waiting = false;
      clearTimeout(job.timeout);
      var finished = (job.urlsNum === job.finishNum)
        , data = {
        campaignId: campaignId,
        urls: job.urls,
        finished: finished
      };
      job.urls = [];
      var res = job.res;
      if (finished) {
        _jobs[campaignId] = null;
        delete _jobs[campaignId]
      }
      res.writeHead(200, {'Content-Type': 'application/json'});
      res.statuCode = 200;
      res.end(JSON.stringify(data));
    }
  }

  function register(campaignId, urls, req, res, next) {
    _jobs[campaignId] = {
      urlsNum: urls.length,
      finishNum: 0,
      urls: [],
      cacheUrls: urls,
      res: null,
      waiting: false,
      timeout: null
    };
    watch(campaignId, req, res, next);
  }

  function watch(campaignId, req, res, next) {
    _jobs[campaignId].res = res;
    // 20s timeout
    _jobs[campaignId].timeout = setTimeout(function () {
      _send(campaignId);
    }, 20000);
  }

  function fire(opts) {
    var campaignId = opts.campaignId
      , job = _jobs[campaignId]
      , fetchObj = fetch(opts.html);

    if (job) {
      if (+opts.status && fetchObj.title) {
        job.urls.push({
          id: opts.id,
          url: opts.url,
          image: opts.image,
          title: fetchObj.title,
          description: fetchObj.description,
          status: +opts.status
        });
      } else {
        job.urls.push({
          id: opts.id,
          url: opts.url,
          status: +opts.status
        });
      }

      if (!job.waiting) {
        job.waiting = true;
        setTimeout(function () {
          _send(campaignId);
        }, 500);
      }
      job.finishNum ++;
    } else {
      console.log('job can not found!');
    }
  }

  function getUrls(campaignId) {
    var job = _jobs[campaignId];
    if (job) return job.cacheUrls;
  }

  return {
    register: register,
    watch: watch,
    fire: fire,
    getUrls: getUrls
  };

})();

  return function (html) {
    if (!html) return { title: false, description: false };

    var title = html.match(/\<title\>(.*?)\<\/title\>/)
      , meta = html.match(/\<meta\s(.*?)\/?\>/g)
      , description;

    if (meta) {
      for (var i = meta.length; i--;) {
        if(meta[i].indexOf('name="description"') > -1 || meta[i].indexOf('name="Description"') > -1){
          description = meta[i].match(/content\=\"(.*?)\"/)[1];
        }
      }
    }

    (title && title[1] !== '') ? (title = title[1]) : (title = 'No Title');
    description || (description = 'No Description');

    return {
      title: title,
      description: description
    };
  };

})();

function snapshot(id, url, imagePath) {
  var page = webpage.create()
    , send
    , begin
    , save
    , end;
  page.viewportSize = { width: 1024, height: 800 };
  page.clipRect = { top: 0, left: 0, width: 1024, height: 800 };
  page.settings = {
    javascriptEnabled: false,
    loadImages: true,
    userAgent: 'Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.31 (KHTML, like Gecko) PhantomJS/1.9.0'
  };
  page.open(url, function (status) {
    var data;
    if (status === 'fail') {
      data = [
        'campaignId=',
        campaignId,
        '&url=',
        encodeURIComponent(url),
        '&id=',
        id,
        '&status=',
      ].join('');
      postPage.open('http://localhost:' + pkg.port + '/bridge', 'POST', data, function () {});
    } else {
      page.render(imagePath);
      var html = page.content;
      // callback NodeJS
      data = [
        'campaignId=',
        campaignId,
        '&html=',
        encodeURIComponent(html),
        '&url=',
        encodeURIComponent(url),
        '&image=',
        encodeURIComponent(imagePath),
        '&id=',
        id,
        '&status=',
      ].join('');
      postMan.post(data);
    }
    // release the memory
    page.close();
  });
}

var postMan = {
  postPage: null,
  posting: false,
  datas: [],
  len: 0,
  currentNum: 0,
  init: function (snapshot) {
    var postPage = webpage.create();
    postPage.customHeaders = {
      'secret': pkg.secret
    };
    postPage.open('http://localhost:' + pkg.port + '/bridge?campaignId=' + campaignId, function () {
      var urls = JSON.parse(postPage.plainText).urls
        , url;

      this.len = urls.length;

      if (this.len) {
        for (var i = this.len; i--;) {
          url = urls[i];
          snapshot(url.id, url.url, url.imagePath);
        }
      }
    });
    this.postPage = postPage;
  },
  post: function (data) {
    this.datas.push(data);
    if (!this.posting) {
      this.posting = true;
      this.fire();
    }
  },
  fire: function () {
    if (this.datas.length) {
      var data = this.datas.shift()
        , that = this;
      this.postPage.open('http://localhost:' + pkg.port + '/bridge', 'POST', data, function () {
        that.fire();
        // kill child process
        setTimeout(function () {
          if (++this.currentNum === this.len) {
            that.postPage.close();
            phantom.exit();
          }
        }, 500);
      });
    } else {
      this.posting = false;
    }
  }
};
postMan.init(snapshot);