lua - 对于循环不完全正确的 Lua

Question

for amountofspinstodo = 1, 100 do
    local pick = math.random( 1, #box.CONTENTS )
    local rarity = INV:CalculateItemRarity()
    local ITEMPICK = INV:GetDataFromName(box.CONTENTS[pick])
    local RARITYS_OF_ITEM_PICK = ITEMPICK.RARITYS
    if has_value(RARITYS_OF_ITEM_PICK, rarity)then
        tbl.spintable[amountofspinstodo] = { NAME = box.CONTENTS[pick], RARITY = rarity }
        print(amountofspinstodo)
    else
        amountofspinstodo = amountofspinstodo - 1
        print(amountofspinstodo)
    end
end

我做了这个 for 循环来检查一个项目是否具有一定的稀有性，如果确实如此，则允许它成为一个项目，但如果它不具有稀有性，那么它应该让 for 循环执行此操作一次，直到每个项目都被挑选。然而，当我运行 for 循环时，它会这样做，我不知道为什么。

Here is the console output

一些数字是重复的，例如 48 和 48 应该是 48 和 49。

如有任何帮助，我们将不胜感激!

-谢谢 D12

Answer 1

amountofspinstodo 无法从您的 for 循环内部更改，并且会持续到循环的下一次运行。

引用资料:

Third, you should never change the value of the control variable: The effect of such changes is unpredictable. If you want to break a for loop before its normal termination, use break. - Programming in Lua: 4.3.4 – Numeric for

这是一个您可以用来查看的简单示例:

for i = 1, 10 do
    print(i) 
    i = 10
end

相反，您应该使用 while 循环:

local amountofspinstodo = 1
while(amountofspinstodo < 100) do
    local pick = math.random( 1, #box.CONTENTS )
    local rarity = INV:CalculateItemRarity()
    local ITEMPICK = INV:GetDataFromName(box.CONTENTS[pick])
    local RARITYS_OF_ITEM_PICK = ITEMPICK.RARITYS
    if has_value(RARITYS_OF_ITEM_PICK, rarity)then
        tbl.spintable[amountofspinstodo] = { NAME = box.CONTENTS[pick], RARITY = rarity }
        print(amountofspinstodo)
        amountofspinstodo = amountofspinstodo + 1
    else
        print(amountofspinstodo)
    end
end