touch moving object

Hello everyone... do you know how to touch the screen anywhere and can move object...left right? here is my code but it doesn't work well

 function Update(){
  var movement : Vector3;
  for(var touch :Touch in Input.touches){
  var ray=Camera.main.ScreenPointToRay(touch.position);
  var hit : RaycastHit;
  if(touch.phase==TouchPhase.Began && Physics.Raycast(ray,hit)){
  print(touch.position.x);
  }
         if(touch.phase==TouchPhase.Moved && Physics.Raycast(ray,hit) || Input.GetKey("a")){
         
             if(touch.position.x>0){
                 
                 print("is Moving");
             }
         }
     }
 }