条码扫描键码映射器未正确映射

如何解决条码扫描键码映射器未正确映射

我使用的是标准 USB 扫描仪，它使用键盘模拟来注册条形码。

当我在文字处理器中扫描条形码时，我得到了正确的数字 - 9420016999708 但是当我尝试从任何 javascript 库或自定义 vanilla 代码执行相同操作时，我得到了非常奇怪的结果 - 使用 onscan.js -

[keyCodeMapper]: Decoding key code "18" to ""
[keyCodeMapper]: Decoding key code "96" to "0"
[keyCodeMapper]: Decoding key code "101" to "5"
[keyCodeMapper]: Decoding key code "103" to "7"
[keyCodeMapper]: Decoding key code "18" to ""
[keyCodeMapper]: Decoding key code "96" to "0"
[keyCodeMapper]: Decoding key code "101" to "5"
[keyCodeMapper]: Decoding key code "98" to "2"
[keyCodeMapper]: Decoding key code "18" to ""
[keyCodeMapper]: Decoding key code "96" to "0"
[keyCodeMapper]: Decoding key code "101" to "5"
[keyCodeMapper]: Decoding key code "96" to "0"
[keyCodeMapper]: Decoding key code "18" to ""
[keyCodeMapper]: Decoding key code "96" to "0"
[keyCodeMapper]: Decoding key code "100" to "4"
[keyCodeMapper]: Decoding key code "104" to "8"
[keyCodeMapper]: Decoding key code "18" to ""
[keyCodeMapper]: Decoding key code "96" to "0"
[keyCodeMapper]: Decoding key code "100" to "4"
[keyCodeMapper]: Decoding key code "104" to "8"
[keyCodeMapper]: Decoding key code "18" to ""
[keyCodeMapper]: Decoding key code "96" to "0"
[keyCodeMapper]: Decoding key code "100" to "4"
[keyCodeMapper]: Decoding key code "105" to "9"
[keyCodeMapper]: Decoding key code "18" to ""
[keyCodeMapper]: Decoding key code "96" to "0"
[keyCodeMapper]: Decoding key code "101" to "5"
[keyCodeMapper]: Decoding key code "100" to "4"
[keyCodeMapper]: Decoding key code "18" to ""
[keyCodeMapper]: Decoding key code "96" to "0"
[keyCodeMapper]: Decoding key code "101" to "5"
[keyCodeMapper]: Decoding key code "103" to "7"
[keyCodeMapper]: Decoding key code "18" to ""
[keyCodeMapper]: Decoding key code "96" to "0"
[keyCodeMapper]: Decoding key code "101" to "5"
[keyCodeMapper]: Decoding key code "103" to "7"
[keyCodeMapper]: Decoding key code "18" to ""
[keyCodeMapper]: Decoding key code "96" to "0"
[keyCodeMapper]: Decoding key code "101" to "5"
[keyCodeMapper]: Decoding key code "103" to "7"
[keyCodeMapper]: Decoding key code "18" to ""
[keyCodeMapper]: Decoding key code "96" to "0"
[keyCodeMapper]: Decoding key code "101" to "5"
[keyCodeMapper]: Decoding key code "101" to "5"
[keyCodeMapper]: Decoding key code "18" to ""
[keyCodeMapper]: Decoding key code "96" to "0"
[keyCodeMapper]: Decoding key code "100" to "4"
[keyCodeMapper]: Decoding key code "104" to "8"
[keyCodeMapper]: Decoding key code "18" to ""
[keyCodeMapper]: Decoding key code "96" to "0"
[keyCodeMapper]: Decoding key code "101" to "5"
[keyCodeMapper]: Decoding key code "102" to "6"
[keyCodeMapper]: Decoding key code "13" to ""
[onScan]: Code: 057052050048048049054057057057055048056 Quantity: 1
onScan configuration updated
onScan Started!

这就是我通过事件函数和 scan.js 存储每个击键时得到的 -

代码：egebe``dhdhdiedegegegeedhef

window.addEventListener('keydown',KeyListen);
function KeyListen(event)
{
Buffer = Buffer + String.fromCharCode(event.keyCode);
}

任何人都可以理解这一点，我想知道这是怎么回事，我怎样才能得到 9420016999708？

如果需要，很高兴显示事件的完整日志详细信息。