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0.1+0.2 !== 0.3？
source link: https://juejin.im/post/5bd2f10a51882555e072d0c4
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前言 众所周知，JavaScript在计算某些浮点数的运算时会出现精度的丢失，比如你在控制台输入0.1+0.2，得到的结果是0.30000000000000004而不是0.3，原因是什么？ 世界上有两种人，懂二进制和不懂二进制的人 我们知道，计算机里所有的数据
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