為什么最后一個(gè)按鈕點(diǎn)擊后沒(méi)有用
<!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(hù)交互的功能。</h5>
??????? <p>1. JavaScript入門(mén)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(mén)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="changeWidth()"/>
??? <input type="button" value="隱藏內(nèi)容" onclick="hideDoc()"/>
??? <input type="button" value="顯示內(nèi)容" onclick="showDoc()"/>
??? <input type="button" value="取消設(shè)置" onclick="lus()"/>
? </form>
? <script type="text/javascript">
//定義"改變顏色"的函數(shù)
?????? var solo=document.getElementById('txt')
????? function changeColor(){
????????? solo.style.color="red"
????????? solo.style.backgroundColor="blue"
????? }
//定義"改變寬高"的函數(shù)
????? function changeWidth(){
????????? solo.style.width="600px"
????????? solo.style.height="700px"
????? }
//定義"隱藏內(nèi)容"的函數(shù)
????? function hideDoc(){
????????? solo.style.display="none"
????? }
//定義"顯示內(nèi)容"的函數(shù)
????? function showDoc(){
????????? solo.style.display="block"
????? }
//定義"取消設(shè)置"的函數(shù)
????? function lus(){
????????? var sill=comfirm("是否取消設(shè)置")
????????? if (sill==true) {
???????????? solo.style.display="none"
????????? }
????????? else{
????????? }
????? }
? </script>
</body>
</html>
2018-12-26
?function lus(){
????????? var sill=comfirm("是否取消設(shè)置")
????????? if (sill==true) {
????????????txt.removeAttribute('style');????????? }
? ? ? ? ??
2018-12-15
if(still==true){
?solo.style="none";
}