                        課程
                    
                        /前端開發
                        
                            /JavaScript
                        
                        /JavaScript入門篇

“取消設置”沒有反應

<!DOCTYPE?HTML>
<html>
<head>
<meta?http-equiv="Content-Type"?Content="text/html;?charset=utf-8"?/>
<title>javascript</title>
<style?type="text/css">
body{font-size:12px;}
#txt{
????height:400px;
????width:600px;
?border:#333?solid?1px;
?padding:5px;}
.rc{
????color:#000;
????background:#fff;
????height:400px;
????width:600px;
????display:block;}????
p{
?line-height:18px;
?text-indent:2em;}
</style>
</head>
<body>
??<h2?id="con">JavaScript課程</H2>
??<div?id="txt">?
?????<h5>JavaScript為網頁添加動態效果并實現與用戶交互的功能。</h5>
????????<p>1.?JavaScript入門篇，讓不懂JS的你，快速了解JS。</p>
????????<p>2.?JavaScript進階篇，讓你掌握JS的基礎語法、函數、數組、事件、內置對象、BOM瀏覽器、DOM操作。</p>
????????<p>3.?學完以上兩門基礎課后，在深入學習JavaScript的變量作用域、事件、對象、運動、cookie、正則表達式、ajax等課程。</p>
??</div>
??<form>
??<!--當點擊相應按鈕，執行相應操作，為按鈕添加相應事件-->
????<input?type="button"?value="改變顏色"?onclick="changecolor()">??
????<input?type="button"?value="改變寬高"?onclick="changewh()">
????<input?type="button"?value="隱藏內容"?onclick="hide()">
????<input?type="button"?value="顯示內容"?onclick="block()">
????<input?type="button"?value="取消設置"?onclick="clearit()">
??</form>
??<script?type="text/javascript">
//定義"改變顏色"的函數
????function?changecolor(){
????????var?cc=document.getElementById("txt");
????????cc.style.color="red";
????????cc.style.backgroundColor="gray";
????}
//定義"改變寬高"的函數
????function?changewh(){
????????var?cwh=document.getElementById("txt");
????????cwh.style.width="300px";
????????cwh.style.height="200px";
????}
//定義"隱藏內容"的函數
????function?hide(){
????????var?hidecontent=document.getElementById("txt");
????????hidecontent.style.display="none";
????}
//定義"顯示內容"的函數
????function?block(){
????????var?bb=document.getElementById("txt");
????????bb.style.display="block";?
????}
//定義"取消設置"的函數
????function?clearit(){
?????????var?mychar?=?document.getElementById("txt");??
????????if(confirm("Do?you?want?to?move?all?out?"))
????????{
????????????mychar.className="rc";
????????}
?????
????}

??</script>
</body>
</html>