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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>
- #btn{
- color: red;
- }
- </style>
- </head>
- <body>
- <button id="btn">按钮</button>
- <script>
- // DOM DOM (Document Object Model)
- // 浏览器预留给js的一方法 用于操作文档 整个页面就是一个文档
- var btn = document.getElementById("btn");
- btn.onclick = function(){
- alert("hello world");
- }
- </script>
- </body>
- </html>
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