<!DOCTYPE html><html><head><meta charset="utf-8"><title>改写自菜鸟教程(runoob.com)</title></head><head><script>function deleteCookie(cname){ ?document.cookie = cname+"=; expires=Thu, 01 Jan 1970 00:00:00 GMT"; }function setCookie(cname,cvalue,exdays){ ?var d = new Date(); ?d.setTime(d.getTime()+(exdays*24*60*60*1000)); ?var expires = "expires="+d.toGMTString(); ?document.cookie = cname+"="+cvalue+"; "+expires;}function getCookie(cname){ ?console.log(document.cookie); ?var name = cname + "="; ?var ca = document.cookie.split(‘;‘); ?for(var i=0; i<ca.length; i++) { ???var c = ca[i].trim(); ???if (c.indexOf(name)==0) { return c.substring(name.length,c.length); } ?} ?return "";}function checkCookie(){ ?var user=getCookie("username"); ?if (user!=""){ ???alert("欢迎 " + user + " 再次访问"); ?} ?else { ???user = prompt("请输入你的名字:",""); ?????if (user!="" && user!=null){ ???????setCookie("username",user,30/24/60/60); ?????} ?}}</script></head> ?<body onload="checkCookie()"></body> ???<button onclick="deleteCookie(‘username‘)">清楚cookie</button></html>js cookie的使用
原文地址：https://www.cnblogs.com/anxiaoyu/p/9083799.html