Javascript中有限制大数字的小数位吗？ [英] Is there a limit in Javascript to decimal places on big floats?

问题描述

  console.log（1234567892012.123456）; // 1234567892012.1234 
 console.log（12345678920123.123456）; // 12345678920123.123 
 console.log（123456789201234.123456）; // 123456789201234.12 
  

这是什么原因造成的？是小数位限制为大数字/浮动？

是否与IEEE 754标准有关（如此处解释：浮点数学是否被打破？）？

最后 - 怎么样我来解决这个问题吗？是的，你看到了64位浮点固有的限制。如果你真的需要两个以上的小数位数，如123,456,789,201,234那么大，你需要某种扩展的算术库。 这个问题有一些建议和讨论。

I'm facing the following issue/behavior:

console.log(1234567892012.123456);   // 1234567892012.1234
console.log(12345678920123.123456);  // 12345678920123.123
console.log(123456789201234.123456); // 123456789201234.12

What is causing this? Are decimal places limited for big numbers/floats?

Is it related to the IEEE 754 standard (as explained here: Is floating point math broken?)?

And finally - how can I come around this issue?

解决方案

Yes, you are seeing the inherent limitations of 64-bit floating point. If you really need more than two decimal places on a number as big as 123,456,789,201,234, you need some sort of extended arithmetic library. This question has some suggestions and discussion.

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