JavaScript-防止八进制转换 [英] JavaScript - Preventing octal conversion

问题描述

我将数字输入作为参数，并试图解释前导零.但似乎javascript将数字转换为八进制，然后我才能对数字进行任何处理.到目前为止，解决此问题的唯一方法是，如果我最初将数字作为字符串传递，但我希望传递后还有另一种方法可以将其转换?到目前为止，已经尝试过(使用 017 使我意识到了八进制行为):

I'm taking a numerical input as an argument and was just trying to account for leading zeroes. But it seems javascript converts the number into octal before I can do anything to the number. The only way to work around it so far is if I pass the number as a string initially but I was hoping there'd be another way to convert it after it is passed? So far tried (using 017 which alerted me to the octal behaviour):

017.toString(10) // 15
parseInt(017,10) // 15
017 + "" //15
new Number(017) //15

new Number('017') //17
parseInt('017', 10) // 17

给定

function(numb) {

if (typeof numb === number) {
// remove leading zeroes and convert to decimal
}
else {
 // use parseInt
}

}

严格使用"似乎也无法解决此问题，如一些较早的帖子所建议的那样.有什么想法吗?

'use strict' also doesn't seem to solve this as some older posts have suggested. Any ideas?

推荐答案

1. 如果您使用数字输入"，则应始终确保具有字符串.在这种情况下，我知道没有输入法会返回 Number .由于您收到一个字符串，因此 parseInt(..，10)总是足够的. 017 仅在源代码中原样编写(或缺少 parseInt 的基数参数)时，才被解释为八进制.

2. 如果出于某种奇怪的原因而最终将十进制解释为八进制，并且想要将值反向转换回十进制，则非常简单:用八进制表示该值并将其重新解释为小数:

1. If you take "numerical input", you should always definitely guaranteed have a string. There's no input method in this context that I know that returns a Number. Since you receive a string, parseInt(.., 10) will always be sufficient. 017 is only interpreted as octal if written literally as such in source code (or when missing the radix parameter to parseInt).

2. If for whatever bizarre reason you do end up with a decimal interpreted as octal and you want to reverse-convert the value back to a decimal, it's pretty simple: express the value in octal and re-interpret that as decimal:

var oct = 017; // 15
parseInt(oct.toString(8), 10) // 17

尽管由于您可能不知道输入最初是八进制还是八进制，所以您永远不必这样做.

Though because you probably won't know whether the input was or wasn't interpreted as octal originally, this isn't something you should have to do ever.

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