ng-focus不适用于AngularJS中的iframe

<iframe src="iframe.html" onload="setupIframe()"></iframe>

function setupIframe() {
  var iframe = document.getElementsByTagName('iframe')[0];
  var iframeWindow = iframe.contentWindow || iframe.contentDocument.defaultView;
  var iframeDocument = iframe.contentDocument || iframe.contentWindow.document;

  iframeWindow.addEventListener('focus', function() {
    var scope = angular.element(iframeDocument).scope();
    scope.$apply(function() {
      scope.onIframeFocus();
    });
  });
}

app.controller('MainController', function($scope) {
  $scope.onIframeFocus = function() {
    // 处理iframe中元素获取焦点的逻辑
  };
});