Javascript 量角器id单击不起作用

我用量角器测量e2e。下面的代码可以很好地打开我的浏览器，但没有单击id，等待一段时间后失败。我错过了什么

describe('Craigslist automation', function() {
    browser.get('http://finance.yahoo.com');
    it('should greet the named user', function() {

        var postLink = element(by.id('yucs-top-news'));
        postLink.click();
        expect(true).toBeTruthy();

    });
});

这是堆栈跟踪

A Jasmine spec timed out. Resetting the WebDriver Control Flow.
The last active task was: 
WebDriver.executeScript()
    at [object Object].webdriver.WebDriver.schedule (/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/node_modules/selenium-webdriver/lib/webdriver/webdriver.js:302:15)
    at [object Object].webdriver.WebDriver.executeAsyncScript (/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/node_modules/selenium-webdriver/lib/webdriver/webdriver.js:538:15)
    at [object Object].Protractor.get (/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/lib/protractor.js:1248:15)
    at [object Object].<anonymous> (/Library/WebServer/Documents/youman/test/spec/spec/example_spec.js:42:13)
    at [object Object].jasmine.Env.describe_ (/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/node_modules/minijasminenode/lib/jasmine-1.3.1.js:913:21)
    at [object Object].jasmine.Env.describe (/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/node_modules/minijasminenode/lib/jasmine-1.3.1.js:898:15)
    at describe (/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/node_modules/minijasminenode/lib/jasmine-1.3.1.js:658:27)
    at Object.<anonymous> (/Library/WebServer/Documents/youman/test/spec/spec/example_spec.js:41:1)
    at Module._compile (module.js:456:26)
F

Failures:

  1) Craigslist automation should greet the named user
   Message:
     timeout: timed out after 10000 msec waiting for spec to complete
   Stacktrace:
     undefined

Finished in 11.011 seconds
1 test, 1 assertion, 1 failure

/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/node_modules/selenium-webdriver/lib/webdriver/promise.js:1640
      var result = fn();
                   ^
Error: Angular could not be found on the page http://finance.yahoo.com/ : retries looking for angular exceeded
    at /Library/WebServer/Documents/youman/test/spec/node_modules/protractor/lib/protractor.js:1254:17
    at /Library/WebServer/Documents/youman/test/spec/node_modules/protractor/node_modules/selenium-webdriver/lib/goog/base.js:1582:15
    at [object Object].webdriver.promise.ControlFlow.runInNewFrame_ (/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/node_modules/selenium-webdriver/lib/webdriver/promise.js:1640:20)
    at notify (/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/node_modules/selenium-webdriver/lib/webdriver/promise.js:444:12)
    at notifyAll (/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/node_modules/selenium-webdriver/lib/webdriver/promise.js:422:7)
    at resolve (/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/node_modules/selenium-webdriver/lib/webdriver/promise.js:400:7)
    at fulfill (/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/node_modules/selenium-webdriver/lib/webdriver/promise.js:512:5)
    at Object.webdriver.promise.asap (/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/node_modules/selenium-webdriver/lib/webdriver/promise.js:758:5)
    at [object Object].webdriver.promise.ControlFlow.runInNewFrame_ (/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/node_modules/selenium-webdriver/lib/webdriver/promise.js:1651:25)
    at notify (/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/node_modules/selenium-webdriver/lib/webdriver/promise.js:444:12)
==== async task ====
WebDriver.executeScript()
    at [object Object].webdriver.WebDriver.schedule (/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/node_modules/selenium-webdriver/lib/webdriver/webdriver.js:302:15)
    at [object Object].webdriver.WebDriver.executeAsyncScript (/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/node_modules/selenium-webdriver/lib/webdriver/webdriver.js:538:15)
    at [object Object].Protractor.get (/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/lib/protractor.js:1248:15)
    at [object Object].<anonymous> (/Library/WebServer/Documents/youman/test/spec/spec/example_spec.js:42:13)
    at [object Object].jasmine.Env.describe_ (/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/node_modules/minijasminenode/lib/jasmine-1.3.1.js:913:21)
    at [object Object].jasmine.Env.describe (/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/node_modules/minijasminenode/lib/jasmine-1.3.1.js:898:15)
    at describe (/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/node_modules/minijasminenode/lib/jasmine-1.3.1.js:658:27)
    at Object.<anonymous> (/Library/WebServer/Documents/youman/test/spec/spec/example_spec.js:41:1)
    at Module._compile (module.js:456:26)
==== async task ====
WebDriver.quit()
    at [object Object].webdriver.WebDriver.schedule (/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/node_modules/selenium-webdriver/lib/webdriver/webdriver.js:302:15)
    at [object Object].webdriver.WebDriver.quit (/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/node_modules/selenium-webdriver/lib/webdriver/webdriver.js:375:21)
    at [object Object].HostedDriverProvider.teardownEnv (/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/lib/driverProviders/hosted.js:47:16)
    at driverprovider_.setupEnv.then.then.then.then.passed (/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/lib/runner.js:280:35)
    at _fulfilled (/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/node_modules/q/q.js:797:54)
    at self.promiseDispatch.done (/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/node_modules/q/q.js:826:30)
    at Promise.promise.promiseDispatch (/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/node_modules/q/q.js:759:13)
    at /Library/WebServer/Documents/youman/test/spec/node_modules/protractor/node_modules/q/q.js:573:44
    at flush (/Library/WebServer/Documents/youman/test/spec/node_modules/protractor/node_modules/q/q.js:108:17)

茉莉花规格超时。重置WebDriver控制流。
上一个活动任务是：
WebDriver.executeScript（）
在[object object].webdriver.webdriver.schedule（/Library/WebServer/Documents/youman/test/spec/node_modules/dragrator/node_modules/selenium webdriver/lib/webdriver/webdriver.js:302:15）
在[object object].webdriver.webdriver.executeAsyncScript（/Library/WebServer/Documents/youman/test/spec/node_modules/dragrator/node_modules/selenium webdriver/lib/webdriver/webdriver.js:538:15）
位于[object object].dragrator.get（/Library/WebServer/Documents/youman/test/spec/node_modules/dragrator/lib/dragrator.js:1248:15）
在[对象]。（/Library/WebServer/Documents/youman/test/spec/spec/example_spec.js:42:13）
在[object object].jasmine.Env.description(/Library/WebServer/Documents/youman/test/spec/node_modules/dragrator/node_modules/minijasminenode/lib/jasmine-1.3.1.js:913:21)
在[object object].jasmine.Env.descripe（/Library/WebServer/Documents/youman/test/spec/node_modules/dragrator/node_modules/minijasminenode/lib/jasmine-1.3.1.js:898:15）
在description（/Library/WebServer/Documents/youman/test/spec/node_modules/dragrator/node_modules/minijasminenode/lib/jasmine-1.3.1.js:658:27）
反对。（/Library/WebServer/Documents/youman/test/spec/spec/example_spec.js:41:1）
在模块处编译（Module.js:456:26）
F
失败：
1） Craigslist automation应该欢迎指定用户
信息：
超时：等待规格完成10000毫秒后超时
堆栈跟踪：
未定义
以11.011秒完成
1次测试，1次断言，1次失败
/Library/WebServer/Documents/youman/test/spec/node_modules/dragrator/node_modules/selenium-webdriver/lib/webdriver/promise.js:1640
var result=fn（）；
^
错误：在页面上找不到角度http://finance.yahoo.com/ ：重试查找已超出的角度
at/Library/WebServer/Documents/youman/test/spec/node_modules/dragrator/lib/dragrator.js:1254:17
at/Library/WebServer/Documents/youman/test/spec/node_modules/dragrator/node_modules/selenium webdriver/lib/goog/base.js:1582:15
在[object object].webdriver.promise.ControlFlow.runInNewFrame(/Library/WebServer/Documents/youman/test/spec/node\u modules/dragrator/node\u modules/selenium webdriver/lib/webdriver/promise.js:1640:20)
在notify（/Library/WebServer/Documents/youman/test/spec/node_modules/dragrator/node_modules/selenium-webdriver/lib/webdriver/promise.js:444:12）
在notifyAll（/Library/WebServer/Documents/youman/test/spec/node_modules/dragrator/node_modules/selenium-webdriver/lib/webdriver/promise.js:422:7）
解析时（/Library/WebServer/Documents/youman/test/spec/node_modules/dragrator/node_modules/selenium-webdriver/lib/webdriver/promise.js:400:7）
完成时（/Library/WebServer/Documents/youman/test/spec/node_modules/dragrator/node_modules/selenium-webdriver/lib/webdriver/promise.js:512:5）
在Object.webdriver.promise.asap（/Library/WebServer/Documents/youman/test/spec/node_modules/dragrator/node_modules/selenium webdriver/lib/webdriver/promise.js:758:5）
在[object object].webdriver.promise.ControlFlow.runInNewFrame(/Library/WebServer/Documents/youman/test/spec/node_modules/dragrator/node_modules/selenium webdriver/lib/webdriver/promise.js:1651:25)
在notify（/Library/WebServer/Documents/youman/test/spec/node_modules/dragrator/node_modules/selenium-webdriver/lib/webdriver/promise.js:444:12）
==异步任务====
WebDriver.executeScript（）
在[object object].webdriver.webdriver.schedule（/Library/WebServer/Documents/youman/test/spec/node_modules/dragrator/node_modules/selenium webdriver/lib/webdriver/webdriver.js:302:15）
在[object object].webdriver.webdriver.executeAsyncScript（/Library/WebServer/Documents/youman/test/spec/node_modules/dragrator/node_modules/selenium webdriver/lib/webdriver/webdriver.js:538:15）
位于[object object].dragrator.get（/Library/WebServer/Documents/youman/test/spec/node_modules/dragrator/lib/dragrator.js:1248:15）
在[对象]。（/Library/WebServer/Documents/youman/test/spec/spec/example_spec.js:42:13）
在[object object].jasmine.Env.description(/Library/WebServer/Documents/youman/test/spec/node_modules/dragrator/node_modules/minijasminenode/lib/jasmine-1.3.1.js:913:21)
在[object object].jasmine.Env.descripe（/Library/WebServer/Documents/youman/test/spec/node_modules/dragrator/node_modules/minijasminenode/lib/jasmine-1.3.1.js:898:15）
在description（/Library/WebServer/Documents/youman/test/spec/node_modules/dragrator/node_modules/minijasminenode/lib/jasmine-1.3.1.js:658:27）
反对。（/Library/WebServer/Documents/youman/test/spec/spec/example_spec.js:41:1）
在模块处编译（Module.js:456:26）
==异步任务====
WebDriver.quit（）
在[object object].webdriver.webdriver.schedule（/Library/WebServer/Documents/youman/test/spec/node_modules/dragrator/node_modules/selenium webdriver/lib/webdriver/webdriver.js:302:15）
在[object object].webdriver.webdriver.quit（/Library/WebServer/Documents/youman/test/spec/node_modules/dragrator/node_modules/selenium webdriver/lib/webdriver/webdriver.js:375:21）
位于[object object].HostedDriverProvider.teardownEnv（/Library/WebServer/Documents/youman/test/spec/node_modules/dragrator/lib/driverProviders/hosted.js:47:16）
在driverprovider上通过（/Library/WebServer/Documents/youman/test/spec/node_modules/dragrator/lib/runner.js:280:35）
完成时（/Library/WebServer/Documents/youman/test/spec/node_modules/progrator/node_modules/q/q.js:797:54）
在self.promiseDispatch.done（/Library/WebServer/Documents/youman/test/spec/node_modules/dragrator/node_modules/q/q.js:826:30）
允诺