ios12safari:有没有办法让基于web的QR扫描正常工作?

有一些基于网络的QR扫描仪的工作实例,特别是 Instascan repo )以及 JsQRScanner repo ). 这两个都在Android上完美地工作。不过,在iPhone上安装ios12的Safari上,示例和代码都出现了可怕的失败,生成了一个视频提要应该在的黑盒,或者根本没有。如果没有mac,我就无法调试它,因为如果无法访问promise对象,我就无法捕获javascript承诺。

我两个图书馆都试过了 and I even communicated with one of the developers

有什么方法可以让事情在Safari上正常运行吗?

/**
 * Sets up the QR scanner.
 * this function will be called when JsQRScanner is ready to use
 * @see https://github.com/jbialobr/JsQRScanner
 */
function JsQRScannerReady() {
    try {
        //create a new scanner passing to it a callback function that will be invoked when
        //the scanner succesfully scan a QR code
        var jbScanner = new JsQRScanner(scanEvent);
        setResult("Constructed JsQRScanner object.");
        //reduce the size of analyzed images to increase performance on mobile devices
        jbScanner.setSnapImageMaxSize(300);
        setResult("setSnapImageMaxSize completed.");
        var scannerParentElement = document.getElementById("videoBoundingBox");
        if (scannerParentElement) {
            //append the jbScanner to an existing DOM element
            jbScanner.appendTo(scannerParentElement);
            setResult("Appended jbScanner to div.");
        }   
    } catch (e) {
        setResult("Caught exception in the camera initialisation.");
        setResult(e.message);
    }
    setResult("initialisation complete.");
}