JS入门练习

<!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课程</h2>
<div id="txt">
<h5>JavaScript为网页添加动态效果并实现与用户交互的功能。</h5>
<p>1. JavaScript入门篇,让不懂JS的你,快速了解JS。</p>
<p>2. JavaScript进阶篇,让你掌握JS的基础语法、函数、数组、事件、内置对象、BOM浏览器、DOM操作。</p>
<p>3. 学完以上两门基础课后,在深入学习JavaScript的变量作用域、事件、对象、运动、cookie、正则表达式、ajax等课程。</p>
</div>
<form>
<input type="button" value="改变颜色" onClick="ChangeColor()">
<input type="button" value="改变宽高" onClick="ChangeHeightWidth()">
<input type="button" value="隐藏内容" onClick="HideText()">
<input type="button" value="显示内容" onClick="DisplayText()">
<input type="button" value="取消设置" onClick="rec()">
</form>
<script type="text/javascript">
function ChangeColor(){
var H2NewColor= document.getElementById("con");
var PNewColor= document.getElementById("txt");
H2NewColor.style.color= "red";
PNewColor.style.color= "blue";
H2NewColor.style.backgroundColor= "#CCC";
PNewColor.style.backgroundColor= "#CCC";
}
function ChangeHeightWidth(){
var H2NewHeightWidth= document.getElementById("con");
var PNewHeightWidth= document.getElementById("txt");
H2NewHeightWidth.style.width= "150px";
H2NewHeightWidth.style.height= "50px";
PNewHeightWidth.style.width= "700px";
PNewHeightWidth.style.height= "500px";
}
function HideText(){
var H2NewHide= document.getElementById("con");
var PNewHide= document.getElementById("txt");
H2NewHide.style.display= "none";
PNewHide.style.display= "none";
}
function DisplayText(){
var H2NewDisplay= document.getElementById("con");
var PNewDisplay= document.getElementById("txt");
H2NewDisplay.style.display= "block";
PNewDisplay.style.display= "block";
}
function rec(){
var SettingConfirm= confirm("取消设置吗?") ;
if(SettingConfirm == true)
{
var H2Style= document.getElementById("con");
var PStyle= document.getElementById("txt");
H2Style.style= "";
PStyle.style= "";
}
}
</script>
</body>
</html>