Phantomjs填充输入字段不适用于login.microsoft.com

Question

我尝试自动登录的站点：login.microsoft.com

输入元素代码为：

<input type="email" name="loginfmt" id="i0116" maxlength="113" lang="en" class="form-control ltr_override" aria-describedby="usernameError loginHeader loginDescription" aria-required="true" data-bind="textInput: usernameTextbox.value,
                hasFocusEx: usernameTextbox.focused,
                placeholder: $placeholderText,
                ariaLabel: tenantBranding.UserIdLabel || str['CT_PWD_STR_Username_AriaLabel'],
                css: { 'has-error': usernameTextbox.error },
                attr: inputAttributes" aria-label="Entrez votre adresse e-mail, numéro de téléphone ou identifiant Skype.">

修改value属性并单击下一步按钮会导致页面显示该字段为空或无效：“ AADSTS90100：登录参数为空或无效。”

如果我输出externalhtml，的确可以按照我的代码进行修改，但是我怀疑login.microsoft.com执行一些我看不到的JavaScript。.

“我的”代码（How to submit a form using PhantomJS）

var page = new WebPage(), testindex = 0, loadInProgress = false;

page.onConsoleMessage = function(msg) {
  console.log(msg);
};

page.onLoadStarted = function() {
  loadInProgress = true;
  console.log("load started");
};

page.onLoadFinished = function() {
  loadInProgress = false;
  console.log("load finished");
};

var steps = [
  function() {
    //Load Login Page

    page.open("https://login.microsoft.com/");
  },
  function() {
    //Enter Credentials
            page.evaluate(function() {

                var el = document.querySelector('input[name="loginfmt"]');
                console.log( el.outerHTML );
                el.setAttribute('value', 'user@myorg.com');

                return;


            });
  },
  function() {
    //Login
    page.evaluate(function() {
          var el = document.querySelector('#idSIButton9');
          var event = document.createEvent('MouseEvent');
          event.initEvent('click', true, false);
          el.dispatchEvent(event);
          return;
    });
  },
  function() {
    // Output content of page to stdout after form has been submitted
    page.evaluate(function() {
      console.log(document.querySelectorAll('html')[0].outerHTML);
    });
  },
];

interval = setInterval(function() {
  if (!loadInProgress && typeof steps[testindex] == "function") {
    console.log("step " + (testindex + 1));
    steps[testindex]();
    testindex++;
  }
  if (typeof steps[testindex] != "function") {
    console.log("test complete!");
    phantom.exit();
  }
}, 50);