与JS中的Number.toExponential相反 [英] Opposite of Number.toExponential in JS
问题描述
我需要以非指数形式在JavaScript中获取极大数字的值。 Number.toFixed
只是以指数形式将其作为字符串返回,这比我的更糟。
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.
这是什么 Number.toFixed
返回:
>>> 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,但我会而是使用本机JS方法(如果存在)。
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。我搜索过高低。
这是我用来将数字分成符号,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+)$/
滚动你自己是你已经做过的答案。
"Roll your own" is the answer, which you already did.
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