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ビューにバインド後、ObservableArrayにObservableItemの追加と削除を繰り返すとメモリ使用量が増加する #245

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mtakeuchi opened this issue Sep 19, 2013 · 0 comments
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@mtakeuchi
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IE7,8で発生することを確認。

HTML

<body>
  <div id="result" data-h5-loop-context="data">
    <div data-h5-bind="message"></div>
  </div>
</body>

JavaScript

IE7では以下のコードを実行すると、約40,000kメモリを使用する

var infoItems = h5.core.data.createObservableArray();
h5.core.view.bind('#result', {data:infoItems});

for (var i = 0; i < 1000; i++) {
  var item = h5.core.data.createObservableItem({
    message: {
      type: 'number'
    }
  });
  item.set('message', i);
  infoItems.unshift(item);

  if (infoItems.length > 10) {
    infoItems.pop();
  }
}

なお、DataItemではObservableItemほどメモリを使用しない
IE7では以下のコードを実行すると、約25,000kメモリを使用する

var infoItems = h5.core.data.createObservableArray();
  h5.core.view.bind('#result', {data:infoItems});

var manager = h5.core.data.createManager('TestDataManager');
var model = manager.createModel({
  name: 'TestModel',
  schema: {
    id: {
      id: true,
      type: 'integer'
    },
    message: {
      type: 'number'
    }
  }
});

for (var i = 0; i < 1000; i++) {
  infoItems.unshift(model.create({id:i, message:i}));

  if (infoItems.length > 10) {
    infoItems.pop();
  }
}
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