iPhone/iPad Pro 3D touch deep detection.

a.js

function _deepDetection(callback) {
    var that   = this;
    var device = this._DEVICE;
    var osVer  = parseFloat(this._OS_VERSION);

    if (this._iOS) {
        _has3DTouchDevice_iOS(function(has) {
            switch (device) {
            case "iPhone 7 Plus":
            case "iPhone 7":
            case "iPhone 6s Plus":
            case "iPhone 6s":
                if (osVer >= 9.0) {
                    that._3D_TOUCH = true;
                }
                break;
            case "iPad Pro 9.7":
            case "iPad Pro":
                if (osVer >= 10.0) {
                    that._3D_TOUCH = true;
                }
                break;
            }
            callback(that);
        });
    } else {
        callback(that);
    }
}

function _has3DTouchDevice_iOS(callback) { // @arg Function - callback(has3DTouchFunction:Boolean):void
    var customTouchEventType = "__taptaptap__";
    var customTouchEvent = _createCustomTouchEvent(customTouchEventType);

    if (customTouchEvent) {
        document.body.addEventListener(customTouchEventType, _handleEvent, false);
        document.body.dispatchEvent(customTouchEvent);
    } else {
        callback(false);
    }

    function _handleEvent(event) {
        var has3DTouchFunction = false;

        if (event.touches && event.touches[0] && "force" in event.touches[0]) {
console.warn("force", event.touches[0].force);
            has3DTouchFunction = true;
        }
        document.body.removeEventListener(customTouchEventType, _handleEvent, false);
        callback(has3DTouchFunction);
    }

    function _createCustomTouchEvent(eventType) {
        if (!Document.prototype.createTouch) {
            return null;
        }
        var view = window;
        var target = document.body;
        var identifier = 100;
        var pageX = 100;
        var pageY = 100;
        var screenX = 100;
        var screenY = 100;
        var clientX = 100;
        var clientY = 100;
        var scale = 1.0;
        var rotation = 0.0;
        var canBubble = true;
        var cancelable = true;
        var detail = 100;
        var ctrlKey = false;
        var altKey = false;
        var shiftKey = false;
        var metaKey = false;
        // createTouch spec: https://developer.apple.com/reference/webkitjs/1777836-createtouch
        var touch = document.createTouch(view, target, identifier, pageX, pageY, screenX, screenY);
        var touches = document.createTouchList(touch);
        var customTouchEvent = document.createEvent("TouchEvent");
        var targetTouches = touches;
        var changedTouches = touches;

        // initTouchEvent spec: https://developer.apple.com/reference/webkitjs/touchevent/1631943-inittouchevent
        customTouchEvent.initTouchEvent(
            eventType, canBubble, cancelable, view, detail,
            screenX, screenY, clientX, clientY,
            ctrlKey, altKey, shiftKey, metaKey,
            touches, targetTouches, changedTouches,
            scale, rotation);
        return customTouchEvent;
    }
}