?

? <script type="text/javascript">
var one=document.getElementById("txt");

function color(){
one.style.color="blue";//定義"改變顏色"的函數(shù)
}

function width(){
one.style.width="350px";
}//定義"改變寬高"的函數(shù)

function hidden(){
one.style.display="none";
}//定義"隱藏內(nèi)容"的函數(shù)

function show(){
one.style.display="block";
}//定義"顯示內(nèi)容"的函數(shù)

function back(){
var msg=confirm( 取消 設(shè)置？)
if(msg==true){
??? one.style.colr="black";
??? one.style.width="600px";
???
}