JS中Number.toExponential的对面 [英] Opposite of Number.toExponential in JS

问题描述

我需要在 JavaScript 中以非指数形式获取一个极大数的值.Number.toFixed 只是将它以指数形式作为字符串返回，这比我的差.

I need to get the value of an extremely large number in JavaScript in non-exponential form. Number.toFixed simply returns it in exponential form as a string, which is worse than what I had.

这是 Number.toFixed 返回的内容:

>>> x = 1e+31
1e+31
>>> x.toFixed()
"1e+31"

Number.toPrecision 也不起作用:

>>> x = 1e+31
1e+31
>>> x.toPrecision( 21 )
"9.99999999999999963590e+30"

我想要的是:

>>> x = 1e+31
1e+31
>>> x.toNotExponential()
"10000000000000000000000000000000"

我可以编写自己的解析器，但如果存在，我宁愿使用原生 JS 方法.

I could write my own parser but I would rather use a native JS method if one exists.

推荐答案

答案是没有这样的内置函数.我搜索了高低.这是我用来将数字拆分为符号、系数(小数点前的数字)、小数部分(小数点后的数字)和指数的 RegExp:

The answer is there's no such built-in function. I've searched high and low. Here's the RegExp I use to split the number into sign, coefficient (digits before decimal point), fractional part (digits after decimal point) and exponent:

/^([+-])?(d+).?(d*)[eE]([+-]?d+)$/

自己动手"就是答案，您已经这样做了.

"Roll your own" is the answer, which you already did.

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