检测对象是否被回收

利用 使用弱引用的Dictionary对象的 key 来存储该对象， gc()后，然后检查 key 是否还存在。

public class ObjectManager
{
private var dic:Dictionary = new Dictionary(true);

/**检测间隔*/
public static var delay:int = 3000;

private static var _ins:ObjectManager;

public function ObjectManager()
{
App.timer.doLoop(delay,check);
}

public static function get ins():ObjectManager{
if (!_ins){
_ins = new ObjectManager;
}
return _ins;
}

private function check():void{
for (var key:* in dic){
trace( dic[key] + "对象还没有被回收");
}
}

/**监测某个对象*/
public function putObject(obj:*,key:String):void{
dic[obj] = key;
}
}

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