javsscript代码的执行顺序 

 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 onload="ready()">
12     <script>
13         window.onload = function () {
14             document.getElementById("btn").onclick = function () {
15                 alert("hello js");
16             }
17         }
18     </script>
19     <input type="button" value="按钮" id="btn">
20 </body>
21 
22 </html>

 

posted @ 2023-02-26 15:14  jason2018  阅读(14)  评论(0)    收藏  举报