                        课程
                    
                        /前端开发
                        
                            /JavaScript
                        
                        /JavaScript入门篇

成功啦大家可以参考一下喔！

<!DOCTYPE html>
<html lang="en">

<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=Edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>HTML</title>
<style>
    body {
      font-size: 12px;
      margin: 0;
    }

    #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="a()">
    <input type="button" value="改变宽高" onclick="b()">
    <input type="button" value="隐藏内容" onclick="c()">
    <input type="button" value="显示内容" onclick="d()">
    <input type="button" value="取消设置" onclick="e()">
</form>
<script>
    function a() {
      var k = document.getElementById("txt");
      k.style.color = "#FE3EA2";
      k.style.backgroundColor = "#000fff"
    }
    function b() {
      var z = document.getElementById("txt");
      z.style.width = "355px";
      z.style.height = "255px"
    }
    function c() {
      var w = document.getElementById("txt");
      w.style.display = "none";
    }
    function d() {
      var h = document.getElementById("txt");
      h.style.display = "block";
    }
    function e() {
      var z = confirm("是否取消设置");
      if (z == true) {
        x = document.getElementById("txt");
        x.style.color = "black";
        x.style.backgroundColor = "#fff";
        x.style.width = "600px";
        x.style.height = "400px";
        x.style.display = "block";
      }
   }
</script>
</body>

</html>