unity 控制一个盒子移动代码

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var target : Transform;
var smoothTime : float;
private var velocity = Vector3.zero;

var x = 10;

var fireRate : float = 0.0;
private var nextFire : float = 0.0;

var postrue : boolean = false;

function Update () {
    
    
    
    target.position.y = x;
    

    
            //TIME
            
            if (Time.time > nextFire) {
                nextFire = Time.time + fireRate;
                postrue = true;
            }
            
            //MOVE
            
            if (postrue)
            {
                smoothTime = 0.05;
                //Random.value;
                fireRate = 0.15;
                //Random.Range(0.1,0.5);
                x *= -1;
                postrue = false;
            }

    transform.position = Vector3.SmoothDamp(transform.position, target.position,
    velocity, smoothTime);
    
    print (smoothTime);
        
}