使用jTopo繪制的拓撲圖在移動端如何實現(xiàn)拖動、縮放？

// 1、定義這兩個函數(shù)
function touchEventToMouseEvent(event, eventType) {
        if (!event.originalEvent || !event.originalEvent.targetTouches || event.originalEvent.targetTouches.length != 1)
            return false;
        var te = event.originalEvent.targetTouches[0];
        var clientX = te.clientX, clientY = te.clientY, screenX = te.screenX, screenY = te.screenY;

        var simEvent = new MouseEvent(eventType, {
            clientX: clientX,
            clientY: clientY,
            screenX: screenX,
            screenY: screenY,
            button: 0,
            buttons: 0
        });
        return simEvent;
    }
    
function findElm(targetElement) {
        targetElement.on('touchstart', function (e) {
            console.log('touchstart');
            console.log(e);
            var simEvent = touchEventToMouseEvent(e, 'mousedown');
            if (simEvent != null) {
                $(this)[0].dispatchEvent(simEvent);
            }
        });

        targetElement.on('touchmove', function (e) {
            e.preventDefault();
            console.log('touchmove');
            var simEvent = touchEventToMouseEvent(e, 'mousemove');
            if (simEvent != null) {
                $(this)[0].dispatchEvent(simEvent);
            }
        });

        targetElement.on('touchend', function (e) {
            console.log('touchend');
            console.log(e);
            var simEvent = touchEventToMouseEvent(e, 'mouseup');
            if (simEvent != null) {
                $(this)[0].dispatchEvent(simEvent);
            }
        });
}
   
// 2、執(zhí)行 findElm(selectorElement) 即可將移動端的touch
findElm(selectorElement);