AngularJS:使用自定义对象进行ng-repeat的内存泄漏(使用/ simple PLUNKER)

时间:2015-02-23 21:39:32

标签: javascript memory-leaks angularjs-ng-repeat

(简单的plunkr demo here

概要

第二次浪潮在自定义对象的“数组”上迭代后使用ng-repeat 发生泄漏,如下所示:

    <div ng-repeat="d_sampleObject in mySampleObjects">
        {{d_sampleObject.description}}
    </div>

内存配置文件显示剩余的'd_sampleObject'未被取消引用。下面是更多细节(通过控制器和注入服务)。在提供的plunkr链接中也进行了简单的演示。任何想法和帮助都提前大受赞赏!

注意:'mySampleObjects'是以下实例的数组:

        ml.MySampleObject = function (id) {

            this.id = id;
            this.description = 'this is object #:' + ' '+id;
        }

详情:

我有一个自定义对象模型,它反映了我们在AngularJS应用中使用的业务域对象。我发现当我将一个自定义对象的实例传递给ng-repeat时,会保留一个引用(我认为是Angular)并且内存未被释放。这发生在ng-repeat的第二个'wave'(点击'refresh')上,因为它再次在其对象数组上进行迭代。此泄漏在我的个人资料测试中公开(在Chrome中)。 Here是plunkr中的一个简短示例。单击“刷新”按钮一次(或更多次)以查看泄漏的额外“d_sampleObject”对象实例(在Chrome配置文件检查中)。注意,'d_sampleObject'名称仅在传递给ng-repeat时使用。我已经包含了下面进一步泄漏的额外对象实例('d_sampleObject')的屏幕截图。为什么会有泄漏?如何避免泄漏?

(注意,我发现如果我不通过对象迭代我的对象集合(JS数组),而是通过原始索引('整数'),则没有泄漏。泄漏似乎只发生在我使用对象引用作为ng-repeat迭代的结果)

SIMPLE HTML:

<!DOCTYPE html>
<html ng-app="memoryleak">

    <head>
    <meta charset="utf-8" />
    <title>Memory Leak Test</title>
    <script>document.write('<base href="' + document.location + '" />');</script>
    <script data-require="angular.js@1.3.x" src="https://code.angularjs.org/1.3.13/angular.min.js" data-semver="1.3.13"></script>

    <script src="app.js"></script>
    <script src="dataservice.js"></script>    
  </head>

  <body ng-controller="MainCtrl">


    <div ng-repeat="d_sampleObject in mySampleObjects">
        {{d_sampleObject.description}}
    </div>

    <br>

    <button ng-click="redo()">Number of refreshes: {{numRedos}}!</button>
  </body>

</html>

SIMPLE APP.JS

(function(ml) {
    var app = angular.module('memoryleak',['servicemodule']);

    app.controller('MainCtrl', ['$scope', 'dataservice', function($scope, dataservice) {

        $scope.redo = function () {

            $scope.numRedos++;

            $scope.mySampleObjects = dataservice.myObjectCollection;

            dataservice.redo();
        }

        $scope.redo();

    }]);

}(window.MEMLEAK = window.MEMLEAK || {}));

SIMPLE dataservice.js

(function(ml) {

    'use strict';

    var serviceModule = angular.module('servicemodule',[]);

    serviceModule.factory('dataservice', ['$rootScope', '$http',
                                        function ($rootScope, $http) {

        this.myObjectCollection = [];

        this.redo = function () {

                this.numRedos++;

            // that.myObjectCollection = [];
            this.myObjectCollection.length = 0;

            for (var i = 0; i < 10; i++) { 
                var sampleObject = new ml.MySampleObject(i);

                that.myObjectCollection.push(sampleObject);
            }   


            sampleObject=null;        

        }

        ml.MySampleObject = function (id) {

            this.id = id;
            this.description = 'this is object #:' + ' '+id;
        }  

        return this;   //return the entire service to make methods accessible to dependents

    }]);

}(window.MEMLEAK = window.MEMLEAK || {}));

SCREENSHOT 1 :(第一页加载 - 创建了10个'mySampleObjects') SCREENSHOT 1:  (FIRST PAGE LOAD--there are 10 'mySampleObjects' created)  屏幕截图2 :(点击刷新 - 创建/泄漏了第11个mySampleObject,引用了传递给ng-repeat的'd_sampleObject'实例名称。) (CLICKED ON REFRESH--there is an 11th mySampleObject created/leaked with a reference to the instance name of 'd_sampleObject' passed to ng-repeat.)

1 个答案:

答案 0 :(得分:5)

AngularJS人员有acknowledgement这确实是框架中的一个错误。修复和提取请求已posted

我还问过正式修复的时间范围。