为什么9999999999999999在JavaScript中转换为10000000000000000？ [英] Why is 9999999999999999 converted to 10000000000000000 in JavaScript?

问题描述

任何人都可以向我解释为什么9999999999999999被转换为10000000000000000？

Can any one explain to me why 9999999999999999 is converted to 10000000000000000?

alert(9999999999999999); //10000000000000000

http://jsfiddle.net/Y2Vb2/

推荐答案

Javascript没有整数，只有64位浮点数 - 而且你已经没有浮点精度了。

Javascript doesn't have integers, only 64-bit floats - and you've ran out of floating-point precision.

在Java中看到类似的问题：为什么Double.parseDouble使9999999999999999变为10000000000000000？

See similar issue in Java: why is the Double.parseDouble making 9999999999999999 to 10000000000000000?

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