                        課程
                    
                        /前端開發(fā)
                        
                            /JavaScript
                        
                        /JavaScript入門篇

請(qǐng)問為了顯示和隱藏出不來

<!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="changeLength()">
????<input?type="button"?value="隱藏內(nèi)容"?onClick="hidden()">
????<input?type="button"?value="顯示內(nèi)容"?onClick="show()">
????<input?type="button"?value="取消設(shè)置"?onClick="restore()">
??</form>
??<script?type="text/javascript">
??var?first=document.getElementById("con");
??var?second=document.getElementById("txt")
//定義"改變顏色"的函數(shù)
????function?changeColor(){
????????first.style.color="red";
????????second.style.color="blue";
????????
????????first.style.backgroundColor="blue";
????????second.style.backgroundColor="red";
????}

//定義"改變寬高"的函數(shù)
????function?changeLength(){
????????first.style.width="600px";
????????first.style.height="300px";
????????
????????second.style.width="200px";
????????second.style.height="300px";
????}

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

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

//定義"取消設(shè)置"的函數(shù)
????function?restore(){
????????var?r=confirm("你確定要這么做嗎？");
????????if(r==true){
????????????first.removeAttribute("style");
????????????second.removeAttribute("style");
????????}
????}


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