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@@ -0,0 +1,39 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+ <style>
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+ .box {
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+ width: 200px;
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+ height: 200px;
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+ background: #f00;
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+ }
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+ </style>
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+</head>
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+<body>
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+ <div class="box"></div>
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+ <button id="btn1">显示</button>
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+ <button id="btn2">隐藏</button>
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+ <script>
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+ // 需求：改变盒子的大小及颜色
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+ // 显示在浏览器五秒后改变
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+ var box = document.querySelector(".box");
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+ var btn1 = document.getElementById("btn1");
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+ var btn2 = document.getElementById("btn2");
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+ setTimeout(()=>{
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+ console.log(box);
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+ box.style.width = "300px";
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+ box.style.height = "300px";
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+ box.style.background = "#00f";
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+ },5000)
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+ btn1.onclick = function() {
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+ box.style.display = "block";
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+ }
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+ btn2.onclick = function() {
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+ box.style.display = "none";
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+ }
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+ </script>
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+</body>
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+</html>
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