根据设备不同选择不同触摸响应对象

function Update () {

var clickDetected : boolean;
var touchPosition : Vector3;

if (Application.platform == RuntimePlatform.IPhonePlayer)
isTouchDevice = true;
else
isTouchDevice = false;

// Detect click and calculate touch position
if (isTouchDevice) {
clickDetected = (Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Began);
touchPosition = Input.GetTouch(0).position;
} else {
clickDetected = (Input.GetMouseButtonDown(0));
touchPosition = Input.mousePosition;
}