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                **sync.Once**是 Golang package 中使方法只執行一次的對象實現,作用與**init**函數類似。但也有所不同。 * **init**函數是在文件包首次被加載的時候執行,且只執行一次 * **sync.Once**是在代碼運行中需要的時候執行,且只執行一次 某些操作在高并發的場景下只執行一次,例如只加載一次配置文件、只關閉一次通道等,我們可以使用**sync.Once**。
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