切换布局
显示结果
<html> <head> <script type = "text/javascript"> <!-- function showValue() { var dayOfMonth = 50; if (dayOfMonth < 1 || dayOfMonth > 31) { dayOfMonth = Number.NaN alert("Day of Month must be between 1 and 31.") } Document.write("Value of dayOfMonth : " + dayOfMonth ); } //--> </script> </head> <body> <p>点击以下按钮查看结果:</p> <form> <input type = "button" value = "Click Me" onclick = "showValue();" /> </form> </body> </html>
