问Unity3D -与对象发生冲突时不显示GUIText

EN

#pragma strict

function Update () {

}

function OnControllerColliderHit(hit : ControllerColliderHit){
    if(hit.gameObject.tag == "Collider"){
        ShowMessage.message = "HELLO WORLD";
        ShowMessage.turnTextOn = true;
    }
}

#pragma strict

static var turnTextOn : boolean = false;
static var message : String;
private var timer : float = 0.0;

function Start(){
    timer = 0.0;
    turnTextOn = false;
    guiText.text = "";
}

function Update () {
    if(turnTextOn){
        guiText.enabled = true;
        guiText.text = message;
        timer += Time.deltaTime;
    }
    if(timer >= 5){
        turnTextOn = false;
        guiText.enabled = false;
        timer = 0.0;
    }
}