<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>计时器</title> <script type="text/javascript"> function clock(){ var time=new Date(); document.getElementById("clock").value = time; } setInterval("clock()",1000); </script> </head> <body> <form> <input type="text" id="clock" size="50" /> <input type="button" value="Stop" onClick="clearInterval(setInterval("clock()",1000))" /> </form> </body> </html>
这样为什么不行?
参数i必须,你必须指明停止对象。你这么写onClick="clearInterval(setInterval("clock()",1000))"(你这里语法有问题,双引号中不能用双引号要用单引号,应这样onClick="clearInterval(setInterval('clock()',1000))"。)相当于 同时启动和停止=没效果