我有一个使用jQuery的带有绘图选项的应用程序。在桌面上一切都很好，但是在移动的设备上不能画线。在touchmove和touchstart上我可以触发控制台日志，但是线不能显示。下面是我目前为止的代码：

<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<script>

    var mousePressed = false;
    var lastX, lastY;
    var ctx;
    var ctxtwo;
    var color;

    ctx = document.getElementById('myCanvas').getContext("2d");
    ctxtwo = document.getElementById('myCanvasTwo').getContext("2d");

    $('#skinModal').click(function () {
        $(".spectrum-input").change(function () {
            color = $(this).val();
        });
    })

    $("#skin-condition-save").click(function () {
        document.getElementById('right_side_face_canvas').value = document.getElementById('myCanvas').toDataURL('image/png');
        document.getElementById('left_side_face_canvas').value = document.getElementById('myCanvasTwo').toDataURL('image/png');
    });

    $('#myCanvas, #myCanvasTwo').mousedown(function (e) {
        var second = false;
        if (e.target.id == 'myCanvasTwo') {
            second = true;
        }
        mousePressed = true;
        Draw(e.pageX - $(this).offset().left, e.pageY - $(this).offset().top, false, second);
    });

    $('#myCanvas, #myCanvasTwo').on("touchstart", function (e) {
        console.log('first');
        var second = false;
        if (e.target.id == 'myCanvasTwo') {
            console.log('second');
            second = true;
        }
        mousePressed = true;
        Draw(e.pageX - $(this).offset().left, e.pageY - $(this).offset().top, false, second);
    });

    $('#myCanvas, #myCanvasTwo').mousemove(function (e) {
        var second = false;
        if (e.target.id == 'myCanvasTwo') {
            second = true;
        }
        if (mousePressed) {
            Draw(e.pageX - $(this).offset().left, e.pageY - $(this).offset().top, true, second);
        }
    });

    $('#myCanvas, #myCanvasTwo').on("touchmove", function (e) {
        console.log('111');
        var second = false;
        if (e.target.id == 'myCanvasTwo') {
            console.log('222');
            second = true;
        }
        if (mousePressed) {
            Draw(e.pageX - $(this).offset().left, e.pageY - $(this).offset().top, true, second);
        }
    });

    $('#myCanvas, #myCanvasTwo').mouseup(function (e) {
        mousePressed = false;
    });

    $('#myCanvas, #myCanvasTwo').mouseleave(function (e) {
        mousePressed = false;
    });

    function Draw(x, y, isDown, isSecond) {
        if (isDown) {

            if (isSecond) {
                ctxtwo.beginPath();
                ctxtwo.strokeStyle = color;
                ctxtwo.lineWidth = $('#selWidth').val();
                ctxtwo.lineJoin = "round";
                ctxtwo.moveTo(lastX, lastY);
                ctxtwo.lineTo(x, y);
                ctxtwo.closePath();
                ctxtwo.stroke();
            } else {
                ctx.beginPath();
                ctx.strokeStyle = color;
                ctx.lineWidth = $('#selWidth').val();
                ctx.lineJoin = "round";
                ctx.moveTo(lastX, lastY);
                ctx.lineTo(x, y);
                ctx.closePath();
                ctx.stroke();
            }
        }
        lastX = x;
        lastY = y;
    }

    function clearArea() {
// Use the identity matrix while clearing the canvas
        ctx.setTransform(1, 0, 0, 1, 0, 0);
        ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
    }

    function clearAreaTwo() {
// Use the identity matrix while clearing the canvas
        ctxtwo.setTransform(1, 0, 0, 1, 0, 0);
        ctxtwo.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
    }
</script>

我需要进行哪些代码修改才能在移动的设备上绘制？