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## 9.5. sync.Once初始化
## 9.5. sync.Once惰性初始化
如果初始化成本比较大的话，那么将初始化延迟到需要的时候再去做就是一个比较好的选择。如果在程序启动的时候就去做这类初始化的话，会增加程序的启动时间，并且因为执行的时候可能也并不需要这些变量，所以实际上有一些浪费。让我们来看在本章早一些时候的icons变量：