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                        /JavaScript入門篇

為什么我的代碼運(yùn)行不了？

<!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;}
????p{
????	line-height:18px;
????	text-indent:2em;}
??</style>
</head>
<body>
??<h2?id="con">JavaScript課程</h2>
??<div?id="txt">
?????<h5>JavaScript為網(wǎng)頁(yè)添加動(dòng)態(tài)效果并實(shí)現(xiàn)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(jìn)階篇，讓你掌握J(rèn)S的基礎(chǔ)語(yǔ)法、函數(shù)、數(shù)組、事件、內(nèi)置對(duì)象、BOM瀏覽器、DOM操作。</p>
????????<p>3.?學(xué)完以上兩門基礎(chǔ)課后，在深入學(xué)習(xí)JavaScript的變量作用域、事件、對(duì)象、運(yùn)動(dòng)、cookie、正則表達(dá)式、ajax等課程。</p>
??</div>
??<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="reset">
??</form>
??<script?type="text/javascript">
????var?con=document.getElementById("con");
????var?txt=document.getElementById("txt");
//定義"改變顏色"的函數(shù)
????function?changeColor(){
??????txt.style.color="#fff";
??????txt.style.backgroundColor="#fff";
??????con.style.color="#fff";
??????con.style.backgroundColor="#fff";
????}

//定義"改變寬高"的函數(shù)
????function?changeSize(){
??????txt.style.width="800px";
??????txt.style.height="800px";
????}

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

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

//定義"取消設(shè)置"的函數(shù)
????function?reset(){
??????if(confirm("是否確定取消更改")){
????????txt.removeAttribute("style");
??????}
????}
??</script>
</body>
</html>