我一直在将从服务接收的所有数据直接保存到局部变量、控制器或作用域。我想什么会被认为是一个浅层的副本，这是正确的吗？
Example:
DataService.callFunction()
.then(function(response) {
$scope.example = response.data;
});
最近，我被告知使用angular.copy来创建深度副本。
$scope.example = angular.copy(response.data);
但是，当我的Angular应用程序使用时，深度复制信息似乎以相同的方式工作。使用深度副本（angular.copy）是否有具体的好处，您能向我解释一下吗？
将对象或数组的值分配给另一个变量并且不应更改该对象值时，请使用 angular.copy。
如果不使用深度复制或使用 angular.copy，更改属性值或添加任何新属性将更新引用同一对象的所有对象。
var app = angular.module('copyExample', []);
app.controller('ExampleController', ['$scope',
function($scope) {
$scope.printToConsole = function() {
$scope.main = {
first: 'first',
second: 'second'
};
$scope.child = angular.copy($scope.main);
console.log('Main object :');
console.log($scope.main);
console.log('Child object with angular.copy :');
console.log($scope.child);
$scope.child.first = 'last';
console.log('New Child object :')
console.log($scope.child);
console.log('Main object after child change and using angular.copy :');
console.log($scope.main);
console.log('Assing main object without copy and updating child');
$scope.child = $scope.main;
$scope.child.first = 'last';
console.log('Main object after update:');
console.log($scope.main);
console.log('Child object after update:');
console.log($scope.child);
}
}
]);
// Basic object assigning example
var main = {
first: 'first',
second: 'second'
};
var one = main; // same as main
var two = main; // same as main
console.log('main :' + JSON.stringify(main)); // All object are same
console.log('one :' + JSON.stringify(one)); // All object are same
console.log('two :' + JSON.stringify(two)); // All object are same
two = {
three: 'three'
}; // two changed but one and main remains same
console.log('main :' + JSON.stringify(main)); // one and main are same
console.log('one :' + JSON.stringify(one)); // one and main are same
console.log('two :' + JSON.stringify(two)); // two is changed
two = main; // same as main
two.first = 'last'; // change value of object's property so changed value of all object property
console.log('main :' + JSON.stringify(main)); // All object are same with new value
console.log('one :' + JSON.stringify(one)); // All object are same with new value
console.log('two :' + JSON.stringify(two)); // All object are same with new value<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="copyExample" ng-controller="ExampleController">
<button ng-click='printToConsole()'>Explain</button>
</div>在这种情况下，您不需要使用angular.copy()
说明 ：
=表示引用，而创建新对象作为深层副本。angular.copy()
使用将意味着更改 的属性将更改 的相应属性，反之亦然。=response.data$scope.example
使用这两个对象将保持独立，并且更改不会相互反映。angular.copy()
