W3School TIY
编辑您的代码：
<html> <head> <script type="text/javascript"> function timedMsg() { var t=setTimeout("alert('5 秒！')",5000) } </script> </head> <body> <form> <input type="button" value="显示定时的警告框" onClick = "timedMsg()"> </form> <p>请点击上面的按钮。警告框会在 5 秒后显示。</p> </body> </html>
查看结果: