https://note.youdao.com/ynoteshare1/index.html?id=bee15cfa51a0292137fc83e3c315a0f4&type=note
单例的7种模式:https://note.youdao.com/ynoteshare1/index.html?id=5d0ad321a1990c7f608ad5794c8203ec&type=note
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