var webdriver = require('selenium-webdriver');

  var driver = new webdriver.Builder()
    .forBrowser('chrome')
    .build();

  driver.get('http://hogehoge.com/');
  driver.executeScript("return JSON.stringify($('.entry-title').map(function(){return $(this).text().trim();}).get());").then(function (return_value) {
    let json = JSON.parse(return_value);
    for (var key in json) {
      let val = json[key];
      fs.writeFile(path.join(__dirname, "data.json"), JSON.stringify(json), function (err) {
        if (err) {
          return console.log(err);
        }
      });
    }