<form>
? <!--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="changeColor()">?
??? <input type="button" value="改變寬高" onclick="changeSize()" >
??? <input type="button" value="隱藏內(nèi)容" onclick="hideContent()">
??? <input type="button" value="顯示內(nèi)容" onclick="showContent()">
??? <input type="button" value="取消設(shè)置" onclick="cancel()">
? </form>
? <script type="text/javascript">
//定義"改變顏色"的函數(shù)
??? function changeColor()
??? {
??????? var temp = document.getElementById("txt");
??????? temp.style.color = "blue";
??????? temp.style.backgroundColor = "gray";
??? }
//定義"改變寬高"的函數(shù)
??? function changeSize()
??? {
??????? var temp = document.getElementById("txt");
??????? temp.style.width = "400px";
??????? temp.style.height ="300px";
??? }
//定義"隱藏內(nèi)容"的函數(shù)
??? function hideContent()
??? {
??????? var temp = document.getElementById("txt");
??????? temp.style.display="none";
??? }
//定義"顯示內(nèi)容"的函數(shù)
??? function showContent()
??? {
??????? var temp = document.getElementById("txt");
??????? temp.style.display = "block";
??? }
//定義"取消設(shè)置"的函數(shù)
??? function cancel()
??? {
??????? var temp = confirm("是否取消設(shè)置？");
??????? if(temp == true)
??????? {
??????????? var temp = document.getElementById("txt");
??????????? temp.removeAttribute('style');
??????? }
??? }
? </script>
</body>
</html>

不知道你錯(cuò)在哪，我代碼運(yùn)行成功了，希望幫到你....

<input type="button" onclick="secai()" value="改變顏色" /> ?

? ? <input type="button" value="改變寬高" onclick="weight()"/>

? ? <input type="button" onclick="hidetext()" value="隱藏內(nèi)容" />

? ? <input type="button" onclick="showtext()" value="顯示內(nèi)容" />

? ? <input type="button" onclick="changeRemove()" value="取消設(shè)置" />

統(tǒng)一吧：

<input type="button" value="改變顏色"?onclick=secai(); /> ?

? ? <input type="button" value="改變寬高" onclick=weight(); />

? ? <input type="button" value="隱藏內(nèi)容"?onclick=hidetext(); ?/>

? ? <input type="button"?value="顯示內(nèi)容" onclick=showtext(); />

? ? <input type="button"?value="取消設(shè)置" onclick=changeRemove(); />

var myyanse=document.getElementById("txt").style.color="red";

var b=document.getElementById("txt").style.display="none";

var b=document.getElementById("txt").style.display="block";

分開寫比較靠譜：

var myyanse=document.getElementById("txt");

myyanse.style.color="red";

var b=document.getElementById("txt");

b.style.display="none";

var b=document.getElementById("txt");

b.style.display="block";

寬高：

?kuangao.style.width=300px;

?kuangao.style.height=200px;

改為：

?kuangao.style.width="300px";

?kuangao.style.height="200px";

var myyanse=document.getElementById("txt").style.color="red";

分開來寫試試。不要急。

var myyanse=document.getElementById("txt");

myyanse.style.color="red";