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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <meta charset="UTF-8">
- <meta name="viewport" content="width=device-width, initial-scale=1.0">
- <title>Document</title>
- <style>
- .box {
- width: 300px;
- height: 300px;
- background: aqua;
- }
- </style>
- </head>
- <body>
- <button id="btn">改变</button>
- <div class="box"></div>
- <script>
- var btn = document.getElementById("btn");
- var box = document.querySelector(".box");
- btn.onclick = function() {
- box.style.background = 'red'
- }
- </script>
- </body>
- </html>
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