源代码:
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Wfuyu教程(wfuyu.com)</title> </head> <body> <p>函数可以自动调用：</p> <p id="demo"></p> <script> (function () { document.getElementById("demo").innerHTML = "Hello! 我是自己调用的"; })(); </script> </body> </html>
运行结果：