ランダムなカラーコード（RGBと16進数）を取得する方法 - Qiita

var hex_numbers = ["0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F"]; var hex = ""; for(var i = 0; i < 6; i++) { hex += hex_numbers[Math.floor(Math.random() * hex_numbers.length)]; } var color_code = `#${hex}`; var rgbArr = []; for(var i = 0; i < 3; i++) { rgbArr.push(Math.floor(Math.random() * 256)); } var color_code = `rgb(${rgbArr[0]}, ${rgbArr[1]}, ${rgbArr[2]})`