<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>javascript</title>
<style type="text/css">
body {
font-size: 12px;
}
#txt {
height: 400px;
width: 600px;
border: 1px solid #333;
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="color()">
<input type="button" value="改变宽度" onclick="wid_height()">
<input type="button" value="隐藏内容" onclick="none()">
<input type="button" value="显示内容" onclick="block()">
<input type="button" value="取消设置" onclick="quxiao()">
</form>
<script type="text/javascript">
function color() {
var yanse = document.getElementById("txt");
yanse.style.color = "#fff";
yanse.style.backgroundColor = "#333";
}
function wid_height() {
var kuangao = document.getElementById("txt");
kuangao.style.width = "400px";
kuangao.style.height = "600px";
}
function none() {
var yincang = document.getElementById("txt");
yincang.style.display = "none";
}
function block() {
var xianshi = document.getElementById("txt");
xianshi.style.display = "block";
}
function quxiao() {
var quxiao = confirm('是否取消设置');
if (quxiao == true) {
var quxiao = document.getElementById("txt");
quxiao.style.color = "#000";
quxiao.style.backgroundColor = "#fff";
quxiao.style.width = "600px";
quxiao.style.height = "400px";
quxiao.style.display = "block";
} else {
}
}
</script>
</body>
</html>// 变量
var objCon = document.getElementById('con');
var objTxt = document.getElementById('txt');
变量可以定义在函数外面，只需要定义一次所有函数都可以使用
取消设置的函数可以这样写
//定义"取消设置"的函数
function cancelSetUp()
{
let check;
check = confirm();
if(check==true)
{
objCon.removeAttribute("style");
objTxt.removeAttribute("style");
}
}
希望有能帮到你
尽可能避免拼音命名吧，好的代码规范也是同样重要的