切换布局
显示结果
<html> <head> <script type = "text/javascript"> <!-- function sayHello() { alert("Hello World") } //--> </script> </head> <body> <p>点击下面按钮，查看结果</p> <form> <input type = "button" onclick = "sayHello()" value = "Say Hello" /> </form> </body> </html>
