<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>编程挑战</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、DOM浏览器、DOM操作。</p>
<p>3.学完以上两门基础课后,再深入学习JavaScript的变量作用域、事件、对象、运动、cookie、正则表达式、Ajax课程等。</p>
</div>
<form>
<input type="button" value="改变颜色" onclick="set.changeColor()">
<input type="button" value="改变宽高" onclick="set.changeSize()">
<input type="button" value="隐藏内容" onclick="set.objHide()">
<input type="button" value="显示内容" onclick="set.objShow()">
<input type="button" value="取消设置" onclick="set.offSet()">
</form>
<script type="text/javascript">
var txt=document.getElementById("txt");
var set={
changeColor:function(){
txt.style.color="red";
txt.style.background="#ccc";
},
changeSize:function(){
txt.style.width="300px";
txt.style.height="300px";
},
objHide:function(){
txt.style.display="none";
},
objShow:function(){
txt.style.display="block";
},
offSet:function(){
var message=confirm("你确定要重置所有设置么？");
if(message==true){
txt.removeAttribute('style');
}
}
}
</script>
</body>
</html>我想知道changecolor,,changeside,,objhide,objshow,offset这些元素是哪里来的啊？
好简洁的写法，点个赞