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为什么(2.55).toFixed(1)等于2.5？
source link: https://juejin.im/post/5a11a9fef265da43284073b4
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上次遇到了一个奇怪的问题：JS的(2.55).toFixed(1)输出是2.5，而不是四舍五入的2.6，这是为什么呢？进一步观察：发现，并不是所有的都不正常，1.55的四舍五入还是对的，为什么2.55、3.45就不对呢？这个需要我们在源码里面找答案。数字在V8
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