这种效果对于有一些动画插件，比如itween就很容易实现，但是他是基于gameobject的，而这代码是基于unity自带的GUI实现的！
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#pragma strict
 
var windowRect = Rect (0, -50, 200 , 50);
var timetext:float=0;
function Start(){
}
function OnGUI () {
    windowRect = GUI.Window (0,Rect(0,windowRect.y,Screen.width,windowRect.height), DoMyWindow, "缩进窗口");
    if(Input.mousePosition.y>700){
        if(timetext==0)
            timetext=Time.time;
        var anim = new AnimationCurve( Keyframe (0, -50), Keyframe (0.5, 10),Keyframe (0.8, -5),Keyframe (1.1, 3),Keyframe (1.6, 0));
         
        windowRect.y=anim.Evaluate(Time.time-timetext);
    }
    else{
        timetext=0;
        if(windowRect.y>-50)
        windowRect.y--;
    }
}
function DoMyWindow (windowID : int) {
    if(GUI.Button (Rect (10,20,100,20), "button1")){
    };
     
    if(GUI.Button (Rect (120,20,100,20), "button2")){
    };
     
    if(GUI.Button (Rect (230,20,100,20), "button3")){
    };
 
}
 
function Update() {
}