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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>
- </head>
- <body>
- <div>按钮</div>
- <script>
- // var arr = [1];
- // var a = 1 + arr[0];
- // var oBtn = document.getElementsByTagName("div");
- // oBtn = oBtn[0];
- var oBtn = document.getElementsByTagName("div")[0];
- console.log(oBtn);
- oBtn.onclick = function(){
- console.log("hello world");
- }
- </script>
- </body>
- </html>
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