定时器案例。
<!-- Author: XiaoWen Create a file: 2016-12-08 12:27:32 Last modified: 2016-12-08 12:51:59 Start to work: Finish the work: Other information: --> <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>随机点名</title> </head> <body> <div style="100px;height:100px;border:1px solid #ccc"></div> <input type="button" value="开始"> <input type="button" value="停止"> <script> var div=document.getElementsByTagName("div")[0]; var arr=["零","一","二","三","四","五","六","七","八","九"] var a_ipt=document.getElementsByTagName("input"); var inter; //定时器的名字,这里要写在外面,否则外面的函数不能找到 a_ipt[0].onclick=function(){ clearInterval(inter) //先清除定时器,不然定时器会累加 inter=setInterval("fn1()",50); //为什么定时器里调用的函数名要加绰号?如果不加,浏览器看到 fn() 就直接执行 fn() 了。而看到被引号包围的 "fn()" 不会。 } function fn1(){ div.innerHTML=arr[parseInt(Math.random()*10)] } a_ipt[1].onclick=function(){ clearInterval(inter) } </script> </body> </html>