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杂项目标是什么意思？它们与我们设定的正常目标有什么不同吗？
我在我分享的以下链接中阅读了它们。
“Cocoa 中弱引用的示例包括但不限于表数据源、大纲视图项、通知观察者以及各种目标和委托。”
https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/MemoryMgmt/Articles/mmPractical.html