Help please I need a jump feature

[Fus_ion]

var myscript = pc.createScript('myscript');


myscript.prototype.initialize = function(){
    this.canJump = false;
    this.entity.collision.on('collisionstart',function(){
    this.canJump = true;
    },this);
};

myscript.prototype.update = function(dt){
   if(this.app.keyboard.isPressed(32) && this.canJump === true)){
        this.entity.applyImpulse(0,40,0);
        this.canJump = false;
   }
};