1 <!DOCTYPE html>
2 <html lang="en">
3
4 <head>
5 <meta charset="UTF-8">
6 <meta http-equiv="X-UA-Compatible" content="IE=edge">
7 <meta name="viewport" content="width=device-width, initial-scale=1.0">
8 <title>Document</title>
9 </head>
10
11 <body>
12 <script>
13 window.onload = function () {
14 let usernameElt = document.getElementById("username");
15 usernameElt.onkeydown = function (event) {
16 alert(event.key);
17 }
18 }
19 </script>
20 <input type="text" name="" id="username">
21 </body>
22
23 </html>
标签：function,javascript,usernameElt,键盘,捕捉,event From： https://www.cnblogs.com/2018jason/p/17157649.html