Question

我有一个例子Plunker。为什么绑定到count: 0不起作用？这是来自* .js文件的代码：

var app = angular.module("MyApp", []);

app.controller("objectCtrl", function($scope, sharingData) {   $scope.message = sharingData.message; });

app.controller("primitiveCtrl", function($scope, sharingData) {   $scope.count = sharingData.message.count; });

app.controller("watchCtrl", function($scope, sharingData) {   $scope.message = {};

  $scope.$watch(function() {
    return sharingData.message.count;   }, function(value) {
    $scope.message.count = value;   }); });

app.factory('sharingData', function() {   return {
    count: 0,
    message: {
      count: 0
    }   }; });

app.run(function($rootScope, sharingData) {   $rootScope.Inc = function() {
    sharingData.message.count = ++sharingData.count;   }; });

Answer 1

因为变量不是通过引用传递的，而是通过值传递的。

为了达到这个目的，你不得不这样做：

app.controller("primitiveCtrl", function($scope, sharingData) {   
    $scope.count = sharingData.message;
});

和

  count from primitiveCtrl:   {{count.count}}

http://plnkr.co/edit/h8A8PwGJuhD2imRbEsNM?p=preview

编辑：事实是，在javascript中无法通过引用传递原始值。可能类似于此的一件事如下：

app.controller("primitiveCtrl", function($scope, sharingData) {   
    $scope.getValue= function(){
      return sharingData.message.count;

    };
});

和

  count from primitiveCtrl:   {{getValue()}}

http://plnkr.co/edit/h8A8PwGJuhD2imRbEsNM?p=preview

为什么角度绑定不适用于服务原语

1 个答案: