我正在尝试在浏览器呈现之前查看实际的html内容。所以我在node.js中使用selenium-webdriver。我的代码是这个，我得到的错误如下
代码：
var webdriver = require('selenium-webdriver');
var driver =new webdriver.Builder().
usingServer('http://localhost:4444/wd/hub').
withCapabilities(webdriver.Capabilities.chrome()).
build();
driver.get('http://www.example.com/example/abc');
driver.getPageSource().then(function(html) {
console.log(html);
return true;
});
driver.quit();
错误：
/home/abhishek/node_modules/selenium-webdriver/lib/webdriver/promise.js:1761
throw error;
^
Error: ECONNREFUSED connect ECONNREFUSED
at ClientRequest.<anonymous> (/home/abhishek/node_modules/selenium-webdriver/http/index.js:145:16)
at ClientRequest.EventEmitter.emit (events.js:95:17)
at Socket.socketErrorListener (http.js:1547:9)
at Socket.EventEmitter.emit (events.js:95:17)
at net.js:441:14
at process._tickCallback (node.js:415:13)
==== async task ====
WebDriver.createSession()
at Function.webdriver.WebDriver.acquireSession_ (/home/abhishek/node_modules/selenium-webdriver/lib/webdriver/webdriver.js:149:22)
at Function.webdriver.WebDriver.createSession (/home/abhishek/node_modules/selenium-webdriver/lib/webdriver/webdriver.js:123:30)
at Builder.build (/home/abhishek/node_modules/selenium-webdriver/builder.js:294:22)
at Object.<anonymous> (/home/abhishek/crawler_postman/crawler_selenium.js:15:14)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)