W3C TIY
（请在下面的文本框中编辑您的代码，然后单击此按钮测试结果。）
编辑您的代码：
<html> <head> <script type="text/javascript"> var c=0 var t function timedCount() { document.getElementById('txt').value=c c=c+1 t=setTimeout("timedCount()",1000) } function stopCount() { clearTimeout(t) } </script> </head> <body> <form> <input type="button" value="Start count!" onClick="timedCount()"> <input type="text" id="txt"> <input type="button" value="Stop count!" onClick="stopCount()"> </form> <p> Click on the "Start count!" button above to start the timer. The input field will count forever, starting at 0. Click on the "Stop count!" button to stop the counting. </p> </body> </html>
查看结果: