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話不多說，請看執行個體代碼
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>前端開發</title></head><body><SCRIPT LANGUAGE="JavaScript">var maxtime;if(window.name=='' || window.name == '-1' || isNaN(window.name)){maxtime = 1*60;}else{maxtime = window.name;}function CountDown(){if(maxtime>=0){hours = Math.floor(maxtime/3600);minutes = Math.floor((maxtime-hours*3600)/60);seconds = Math.floor(maxtime%60);msg = "距離考試結束還有"+hours+"時"+minutes+"分"+seconds+"秒";document.all["timer"].innerHTML = msg;if(maxtime == 5*60) alert('注意，還有5分鐘!');--maxtime;window.name = maxtime;}else{clearInterval(timer);alert("考試時間到，結束!");}}timer = setInterval("CountDown()",1000);</SCRIPT><div id="timer" style="color:red"></div></body></html>
js控制定時執行,每隔一段時間定時執行
//後台查詢執行請求 1min , ajax_wx_payment 為方法名setInterval(ajax_wx_payment,1000*60);
js控制延時跳轉
//延遲跳轉 20minsetTimeout('ys_time_out()', 1000*60*20);
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