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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>安科教程(www.ancii.com)</title> </head> <body> <p id="p1">Hello World!</p> <script id="myScript" src="demo_async.js" async></script> <p>点击按钮检测是否异步执行脚本（一旦脚本可用）。</p> <p id="demo"></p> <button onclick="myFunction()">尝试一下</button> <script> function myFunction(){ var x = document.getElementById("myScript").async; document.getElementById("demo").innerHTML = x; }; </script> </body> </html>
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