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我怎么说没见过，原来是两个运算符的组合：-- 自减运算符和 > 大于运算符。
--
>
先判断 x 是否大于0，若成立则 x 自减。这样 x 就会像 0 趋近，直到不大于 0。这种写法其实就是 (x--) > 0……
x
(x--) > 0
