源代码
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>编程字典</title> </head> <body> <p id="p1">Hello World!</p> <script src="demo_async.js" async></script> <p><strong>注意:</strong> async 属性 不支持IE9和更早的版本。</p> </body> </html>
运行结果