(简单的plunkr demo here)
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;
}
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)
<!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>
(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();
}
$scope.redo();
}]);
}(window.MEMLEAK = window.MEMLEAK || {}));
(function(ml) {
'use strict';
var serviceModule = angular.module('servicemodule',[]);
serviceModule.factory('dataservice', ['$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') 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。)