In most cases , cyclical references will not be used in the first place , and even if they are , most times the memory leakage will be small you can easily construct artificial cases of dangerous behavior ; for example , add a 可以一直在后臺運行,當(dāng)切換到它的會話并運行轉(zhuǎn)換時,我們希望它能夠使用最新的程序邏輯。對于這個特定的簡單示例,關(guān)閉和重新啟動應(yīng)用程序并不難,并不會帶來特別的損害。