為啥一個按鈕都沒效果
<!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)頁添加動態(tài)效果并實現(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、對象、運動、cookie、正則表達(dá)式、ajax等課程。</p>
? </div>
? <form>
? <!--當(dāng)點擊相應(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="hidetext()">
? ? <input type="button" value="顯示內(nèi)容" ?onClick="showtext()">
? ? <input type="button" value="取消設(shè)置" ?onClick="stopset()">
? </form>
? <script type="text/javascript">
? var lib=document.grtElementById("con");
? ?var kik=document.grtElementById("text");
//定義"改變顏色"的函數(shù)
?function changeColor()
?{
? ? ?kik.style.color="red";
? ? ?kik.style.backgroundColor="#CCC";?
?}
//定義"改變寬高"的函數(shù)
function changeSize()
{
? ? kik.style.width="200px";?
? ? kik.style.height="800px";
}
//定義"隱藏內(nèi)容"的函數(shù)
function hidetext()
{
? ? kik.style.display="none";
}
//定義"顯示內(nèi)容"的函數(shù)
function showtext()
{
? ? kik.style.display="block";
}
//定義"取消設(shè)置"的函數(shù)
function stopset()
{
? ? var tit=confirm();
? ? if(tit==true){
? ? ? ?tit.removeAttribute("style");
? ? }
}
? </script>
</body>
</html>
2017-08-13
? ?var kik=document.grtElementById("txt");
2017-08-13
<!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)頁添加動態(tài)效果并實現(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、對象、運動、cookie、正則表達(dá)式、ajax等課程。</p>
</div>
<form>
??? <!--當(dāng)點擊相應(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" >
??? <input type="button" value="改變寬高" >
??? <input type="button" value="隱藏內(nèi)容" >
??? <input type="button" value="顯示內(nèi)容" >
??? <input type="button" value="取消設(shè)置" >
</form>
<script type="text/javascript">
??? window.onload=function() {
??????? var text = document.getElementsByTagName("input");
??????? for (var i = 0; i < text.length; i++) {
??????????? text[i].onclick = function () {
??????????????? var obj = document.getElementById("txt");
??????????????? if (this.value == "改變顏色") {
??????????????????? obj.style.color = "red";
??????????????????? obj.style.backgroundColor = "blue"
??????????????? } else if (this.value == "改變寬高") {
??????????????????? obj.style.width="400px";
??????????????????? obj.style.height="200px";
??????????????? } else if (this.value == "隱藏內(nèi)容") {
??????????????????? obj.style.display="none";
??????????????? } else if (this.value == "顯示內(nèi)容") {
??????????????????? obj.style.display="block";
??????????????? } else {
??????????????????? var cfm = confirm("是否取消設(shè)置！");
??????????????????? if(cfm==true){
??????????????????????? obj.style="";
??????????????????? }
??????????????? }
??????????? }
??????? }
??? }
</script>
</body>
</html>