为什么.toString(16)将rgb，十进制或其他输入转换为十六进制 [英] Why does .toString(16) convert rgb, decimal, or other inputs into a hexidecimal

问题描述

我试图在所有可以找到答案的地方进行搜索，以了解.toString(16)为什么将数字转换为十六进制值.我的第一个问题是，为什么16?我的第二个问题是，即使我看不到代码中的字母，这怎么能返回字母.例如，我不明白下面的代码如何返回ff而不是数字.

I've tried searching everywhere I could to find the answer as to why .toString(16) converts a number to a hexidecimal value. My first question is, why 16? My second question is, how can this return letters even though I see no letters going into the code. For example, I don't understand how the following code returns ff instead of a number.

var r = 255;
r.toString(16); //returns ff

如果有人对此有任何链接或见解，请告诉我.我很好奇.预先谢谢你！

If anyone has any links or insights as to why this is, please let me know. I'm very curious. Thank you in advance!

推荐答案

十六进制为基数16.分解单词:hexa，含义为6；十进制，表示10.10+ 6 =16.一些主要的基数是:

Hexadecimal is base 16. Break down the words: hexa, meaning 6; decimal, meaning 10. 10 + 6 = 16. A few major bases are:

• 基数2:二进制，2个数字:[0，1]
• 基数8:八进制，8个数字:[0，7]
• 以10为基数:十进制，10个数字:[0、9]
• 基数16:十六进制，16个符号:[0，9]和[A，F]

根据 MDN文档 :

对于Number对象，toString()方法以指定的基数返回对象的字符串表示形式.

For Number objects, the toString() method returns a string representation of the object in the specified radix.

参数

基数: 选修的. 2到36之间的整数，指定用于表示数值的基数.

radix: Optional. An integer between 2 and 36 specifying the base to use for representing numeric values.

这意味着它将根据基数将数字转换为字符串. Number.prototype.toString的语法为:

This means it converts the number into a string, and based on the radix. The syntax for Number.prototype.toString is:

number.toString([radix])

radix是可选的.如果指定基数，它将以该基数转换，因此16是十六进制.如果未指定radix，则假定为10(十进制).这是一个片段:

Where radix is optional. If you specify the radix, it will convert with that base, so 16 is hexadecimal. If radix is not specified, 10 (decimal) is assumed. Here's a snippet:

var num = 16;

console.log(num.toString()) //"16", base 10 is assumed here if no radix given
console.log(num.toString(16)) //"10", base 16 is given

现在，关于RGB值:以(255，255，255)[白色]为例.每个单独的值(红色，绿色或蓝色)均以十六进制表示.由于255是0xFF或只是十六进制的FF，因此完整的表示形式是FFFFFF或ffffff.

Now, regarding RGB values: take (255, 255, 255) [white] as an example. Each individual value (red, green, or blue) is represented in hex. Since 255 is 0xFF or simply FF in hex, the full representation is FFFFFF, or ffffff you see.

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