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JavaScript: Math.random() でランダムな数値を作る

Last updated at Posted at 2020-01-31

Math.random() を使うと、0以上、1未満のランダム値を生成する。つまり、0.1とか、0.9とか。
Math.random() * 3 とすると、0から2までのランダム値、例えば1.4とかにすることができる。
小数点以下がいらない場合、Math.floorで囲んであげる。
Math.floor(Math.random() * 3) という感じ。

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