JavaScript定时器的开启关闭
<html> <head> <meta charset="utf-8"> <title>无标题文档</title> <style type="text/css"> #btn1:hover,#btn2:hover { background: red; } </style> </head> <body> <input type="button" id="btn1" value="开启" /> <input type="button" id="btn2" value="关闭" /> <script> var obtn1=document.getElementById('btn1'); var obtn2=document.getElementById('btn2'); var timer=null; obtn1.onclick=function() { timer=setInterval(function() //开启循环:每秒出现一次提示框 { alert('a'); },1000); } obtn2.onclick=function() { clearInterval(timer); //关闭循环 } </script> </body> </html>
欢迎访问每天进步网:https://meitianjinbu.cn/