https://zhuanlan.zhihu.com/p/25888319
https://www.w3cplus.com/javascript/tifu-by-using-math-random.html
看到本版那个玩彩票的帖子，lz等对随机数的产生有些误解
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修改:sosei FROM 119.248.230.*
FROM 119.248.230.*