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

為什么每個(gè)按鈕都沒有起作用呢

<!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>
? 
??? <input type="button" value="改變顏色" onlick="set.changeColor()">?
??? <input type="button" value="改變寬高" onlick="set.changeSize()">
??? <input type="button" value="隱藏內(nèi)容" onlick="set.objHide()">
??? <input type="button" value="顯示內(nèi)容" onlick="set.objShow()">
??? <input type="button" value="取消設(shè)置" onlick="set.offSet()">
? </form>
? <script type="text/javascript">
? var txt=document.getElementById("txt");
? var set=
? {
????? changeColor:function()
????? { txt.style.color="red";
??????? txt.style.backgroundColor="black";
????? },
????? changeSize:function()
????? {
????????? txt.style.width="200px";
????????? txt.style.height="300px";
????? },
????? objHide:function()
????? {
???????? txt.style.display="none";
????? },
????? objShow:function()
????? {
????????? txt.style.display="block";
????? },
????? offSet:function()
????? {
????????? var nocancel=confirm("確認(rèn)取消設(shè)置?");
????????? if(nocancel==true)
????????? {txt.removeAttribute('style'); }
????? }
? }