从颜色数组中随机挑选4个颜色

以下是可能的其中一种方式：

allColors = {"black", "white", "red", "orange", "yellow", "green",
    "blue", "indigo", "violet", "gold", "silver", "bronze"}
chosenColors = {}

while #chosenColors < 4 do
    n = math.random(1, #allColors)
    table.insert(chosenColors, allColors[n])
    table.remove(allColors, n)
end

然后：

for k, v in pairs(chosenColors) do
    print(k, v)
end

这将打印出例如：

1 white
2 indigo
3 red
4 gold