Angularjs 如何将作用域的深度复制到一个没有'；t跟踪原始范围的更改？

我用的是Angular JS，我有两个示波器

$scope.selected = {
    ids: []
};

$scope.copy = {
    ids: []
};

当我点击一个按钮时，我想要

$scope.copy

从

$scope.selected

获取元素，所以我这样做了

<button ng-click="copy=selected">copy</button>

当原始作用域中的值被更新时，如何创建一个不更新的副本？

使用应该可以做到这一点

<button ng-click="copyScope()">copy</button>

function copyScope () {
    $scope.copy = angular.copy($scope.selected);
}

<button ng-click="copyScope()">copy</button>

function copyScope () {
    $scope.copy = angular.copy($scope.selected);
}

<div ng-app="myApp" ng-controller="myController">
    <button ng-click="copyOriginal()">copyOriginal</button>
    <button ng-click="touchOriginal()">touchOriginal</button>
    <pre> {{original}} </pre>
    <pre> {{copy}} </pre>
</div>

$scope.original = [1, 2, 3];
$scope.copy = [];

$scope.touchOriginal = function () {
    $scope.original.push(4);
};

$scope.copyOriginal = function () {
    $scope.copy = angular.copy($scope.original);
    console.log($scope.copy);
}

$scope.$watch('copy', function (newCopy, oldCopy) {
    // Nothing should happen here when you trigger `touchOriginal()`
    console.log(newCopy, oldCopy);
});