【JS】重複しないランダムな三桁の数字を作る - Qiita

// ランダムな三桁の数字 function three_random_number() { const three_digit_number = []; for (let i = 0; three_digit_number.length < 3; i++) { const number = Math.floor(Math.random() * 10) if(!three_digit_number.includes(number)){ three_digit_number.push(number); } } console.log(three_digit_number); } three_random_number() コードの説明 const three_digit_number = [];：カラの配列の作成 for (let i = 0; three_digit_number.leng