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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: 100px;
- }
- </style>
- </head>
- <body>
- <img src="./image/img2.png" alt="img">
- <script>
- var img = document.getElementsByTagName("img")[0];
- // setAttribute 接受两个参数第一个是属性名，第二个是属性值
- img.setAttribute("src","./image/img1.png");
- img.setAttribute("class","box");
- console.log(img.getAttribute("alt"));
- </script>
- </body>
- </html>
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