<p id="demo"></p> <button onclick="myStopFunction()">Stop time</button> <script> var myVar=setInterval(function(){myTimer()},1000); function myTimer() { var d=new Date(); var t=d.toLocaleTimeString(); document.getElementById("demo").innerHTML=t; } function myStopFunction() { clearInterval(myVar); } </script>
原文：http://www.cnblogs.com/hanbingljw/p/3977648.html