function quxiao()
???? {
???? var add=confirm("確定要取消所有設置嗎！");
???? if(add==true)
????? {
?? var add=document.getElementById("txt");
???? add.style.backgroundColor="";
???? add.style.color="";
???? add.style.width="";
???? add.style.height="";
???? add.style.display="";
??
}
else{return};
}