var ray = Camera.main.ScreenPointToRay (Input.mousePosition);
var hit : RaycastHit;
if (Physics.Raycast (ray, hit, 100)) {
var target: GameObject = hit.collider.gameObject//獲得點(diǎn)擊的物體
if(Input.getMouseButtonDown("0"))
{
target.transform.position = (Input.mousePosition);
}
}

先獲取鼠標(biāo)坐標(biāo)然后再發(fā)射射線檢測(cè)