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var dianji:Boolean=true;  
 
function Button1(a:MouseEvent) {  
    if (dianji==true) {  
 
        niao_mc.gotoAndPlay(1);  
        dianji=false;  
    } else {  
        niao_mc.gotoAndStop(1);  
        dianji=true;  
    }  
}  
 
btn1.addEventListener(MouseEvent.CLICK,Button1);