<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>練習</title> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script> <script src="sample.js"></script> </head> <body onload="play()"> <p id="memo"></p> </body> </html> function play(){ var timer; var delay = 1000; n=0; var loop = function () { n=n+1; $("#memo").html(n); clearTimeout(timer); timer = setTimeout(loop, delay); } loop(); }