专注前端素材！
源代码：
点击运行
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>素材8网教程(study.sucai8.cn)</title> </head> <head> <script> 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){ 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("Welcome again " + user); } else { user = prompt("Please enter your name:",""); if (user!="" && user!=null){ setCookie("username",user,30); } } } </script> </head> <body onload="checkCookie()"></body> </html>
运行结果