How I create one static custom function call back for SystemEvents in Cocos Creator?

cocos2d-x JavaScript
#1

But I’m pretty confuse about how to use the cc.EventManager and SystemEvent classes I how I use then ?
I have many sprites nodes that I want to make a fixed function callback to touch move for then, I was trying using:

let potion_a = this.potionSprite;
this.potion_a on(‘touchmove’, function(event) {

        potion_a.x += event.touch.getDelta().x;
        potion_a.y += event.touch.getDelta().y;
        /* Act on the event */
    }, this.node);

I want that “function that are created inline to be moved to one single static function to manage all inside the canvas class, like
node.on('touchmove”, moveManager(), this.node); … …
////
moveManger : function(events)
{
},

But the game don’t even run with this