?<!--當(dāng)點(diǎn)擊相應(yīng)按鈕，執(zhí)行相應(yīng)操作，為按鈕添加相應(yīng)事件-->
??? <input type="button" value="改變顏色" onClick="ab()">?
??? <input type="button" value="改變寬高" onClick="a2()">
??? <input type="button" value="隱藏內(nèi)容" onClick="a3()">
??? <input type="button" value="顯示內(nèi)容" onClick="a4()">
??? <input type="button" value="取消設(shè)置" onClick="a5()">
? </form>
? <script type="text/javascript">
//定義"改變顏色"的函數(shù)?
?function ab(){ var mychar=document.getElementById("txt");

??????????????????? mychar.style.color="red";

??????????????????? mychar.style.backgroundColor="#ccc";}

function a2()
{var mychar=document.getElementById("txt");
mychar.style.width="400px";//定義"改變寬高"的函數(shù)
mychar.style.height="300px";
}
function a3()
{var mychar=document.getElementById("txt")
mychar.style.display="none";//定義"隱藏內(nèi)容"的函數(shù)
}
function a4()
{var mychar=document.getElementById("txt")
mychar.style.display="block";//定義"顯示內(nèi)容"的函數(shù)
}
function a5()
{var a=confirm("是否取消設(shè)置？")；
if(a==true)
{
var e2=document.getElementById"txt";
e2.removeAttribute("style");
}
else
{return};}
//定義"取消設(shè)置"的函數(shù)