Function normalizeEvent

_benchmarks/sample_echarts.js:1255–1278

(el, e, calculate)

            || window.event;
    }
    function normalizeEvent(el, e, calculate) {
        e = getNativeEvent(e);
        if (e.zrX != null) {
            return e;
        }
        var eventType = e.type;
        var isTouch = eventType && eventType.indexOf('touch') >= 0;
        if (!isTouch) {
            clientToLocal(el, e, e, calculate);
            var wheelDelta = getWheelDeltaMayPolyfill(e);
            e.zrDelta = wheelDelta ? wheelDelta / 120 : -(e.detail || 0) / 3;
        }
        else {
            var touch = eventType !== 'touchend'
                ? e.targetTouches[0]
                : e.changedTouches[0];
            touch && clientToLocal(el, touch, e, calculate);
        }
        var button = e.button;
        if (e.which == null && button !== undefined && MOUSE_EVENT_REG.test(e.type)) {
            e.which = (button & 1 ? 1 : (button & 2 ? 3 : (button & 4 ? 2 : 0)));
        }
        return e;
    }
    function getWheelDeltaMayPolyfill(e) {
        var rawWheelDelta = e.wheelDelta;
        if (rawWheelDelta) {