Javascript Math.cos和Math.sin不准确。有什么解决方案吗？ [英] Javascript Math.cos and Math.sin are inaccurate. Is there any solution?

问题描述

Javascript Math trigonomerial methos返回错误的结果。
尝试

Javascript Math trigonomerial methos return wrong results. Try

alert(Math.sin(Math.PI));

它不会返回0.

也许问题是javascript十进制数精度。是否有任何工作量来获得正确的结果？

Maybe problem is with javascript decimal number precision. Is there any workoround to get correct results?

推荐答案

尽管如此，它非常接近于零。 （~10 ^ -16）

It's very, very close to zero, though. (~ 10^-16)

和 alert（Math.sin（Math.PI / 2））返回 1 。

这只是处理浮点运算时必须注意的事项之一。舍入错误会在整个地方弹出。

It's just one of things you have to be careful of when dealing with floating point arithmetic. Rounding errors pop up all over the place.

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