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今天脑子突然抽了，截取字符的时候想把[1651114259328487426]截取成1651114259328487426我知道是substring从1开始截取，但是为什么最后是length()... 1970-01-01T08:00:00+08:00 Typecho https://blog.iletter.top/index.php/feed/atom/archives/108.html