如何获取Java中字符的Unicode代码点？ [英] How to get the Unicode code point for a character in Javascript?
问题描述
我正在使用条形码扫描仪来读取我的网站上的条形码（该网站是在OpenUI5中创建的。）
I'm using a barcode scanner to read a barcode on my website (the website is made in OpenUI5).
扫描仪的工作原理就像是一个键盘，可以输入它读取的字符。在键入的结尾和开头，它使用特殊字符。对于每种类型的扫描仪，这些字符都不同。
The scanner works like a keyboard that types the characters it reads. At the end and the beginning of the typing it uses a special character. These characters are different for every type of scanner.
某些可能的字符是：
- █
- –
- —
- █
- ▄
- –
- —
在我的代码中，我使用 if（oModelScanner.oData.scanning& oEvent.key == \u2584）检查扫描仪的输入是否为。
In my code I use if (oModelScanner.oData.scanning && oEvent.key == "\u2584") to check if the input from the scanner is ▄.
有没有办法从\uHHHH样式的那个字符中获取代码？ （HHHH是字符的十六进制代码）
Is there any way to get the code from that character in the \uHHHH style? (with the HHHH being the hexadecimal code for the character)
我尝试了 charCodeAt ，但这会返回十进制代码。
I tried the charCodeAt but this returns the decimal code.
使用 codePointAt示例，它们将我需要的代码转换为十进制代码，所以我需要与此相反。 / p>
With the codePointAt examples they make the code I need into a decimal code so I need a reverse of this.
推荐答案
JavaScript字符串具有方法 codePointAt 会为您提供以10为底的给定符号的整数值，然后，如果您希望将整数格式化为四个十六进制数字，则需要将其转换为以16为底的整数（十六进制）序列（如Nikolay Spasov的回应）。
Javascript strings have a method codePointAt which gives you the integer value of a given symbol in base 10, you need then to convert your integer in base 16 (hexadecimal) if you wish to format the integer into a four hexadecimal digits sequence (as in the response of Nikolay Spasov).
var hex = "▄".codePointAt(0).toString(16);
var result = "\\u" + "0000".substring(0, 4 - hex.length) + hex;
但是，直接检查关键码点整数是否与预期代码匹配可能更容易点
However it would probably be easier for you to check directly if you key code point integer match the expected code point
oEvent.key.codePointAt(0) === '▄'.codePointAt(0);
请注意，符号相等实际上可能比较棘手：某些符号由代理对定义（您可以
Note that "symbol equality" can actually be trickier: some symbols are defined by surrogate pairs (you can see it as the combination of two halves defined as four hexadecimal digits sequence).
出于这个原因，我建议使用专门的库。将其视为定义为四个十六进制数字序列的两半的组合。
For this reason I would recommend to use a specialized library.
您将在非常相关的内容中找到更多详细信息Mathias Bynens的文章
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