Duff 裝置

create by Tom Duff, first used in C；first used in JS by Jeff Greenbergjavascript 基本概念：經過迭代的次數是否爲8的倍數講一個循環展開爲一系列的語句 //credit: Jeff Greeberg for JS implementation of Duff's Device //假設value.length>0 var

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