###0~1未満のランダム値
Math.random()
###小数点以下切り捨て
Math.floor
##ランダムな整数値
// 0,1,2 のランダムな整数値
Math.floor(Math.random() * 3)
// 0.....n のランダムな整数値
Math.floor(Math.random()*(n + 1))
// min.....max のランダムな整数値
min + Math.floor(Math.random()*(max + 1 - min ))
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