总结十个Angular.js由浅入深的面试问题

// .$watch() 会返回一个停止注册的函数
function that we store to a variable 
var deregisterWatchFn = $rootScope.$watch(‘someGloballyAvailableProperty', function (newVal) { 
 if (newVal) {
  // we invoke that deregistration function, to disable the watch
  deregisterWatchFn();
  ...
 }
});

angular.module('docsIsolationExample', []) 
.controller('Controller', ['$scope', function($scope) {
 $scope.alertName = function() {
   alert('directive scope &');
 }
}])
.directive('myCustomer', function() {
 return {
  restrict: 'E',
  scope: {
   clickHandle: '&'
  },
  template: '<button ng-click="testClick()">Click Me</button>',
  controller: function($scope) {

   $scope.testClick = function() {
    $scope.clickHandle();

   } 
  }
 };
});

<div ng-app="docsIsolationExample"> 
<div ng-controller="Controller"> 
 <my-customer click-handle="alertName()"></my-customer>
</div> 
 </div>

myApp.config(function ($compileProvider) { 
 $compileProvider.debugInfoEnabled(false);
});

console.time("TimerName"); 
//your code
console.timeEnd("TimerName"); 

describe('calculator', function () {

 beforeEach(module('calculatorApp'));

 var $controller;

 beforeEach(inject(function(_$controller_){
  $controller = _$controller_;
 }));

 describe('sum', function () {
    it('1 + 1 should equal 2', function () {
      var $scope = {};
      var controller = $controller('CalculatorController', { $scope: $scope });
      $scope.x = 1;
      $scope.y = 2;
      $scope.sum();
      expect($scope.z).toBe(3);
    });  
  });

});