W3School TIY Editor
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<!DOCTYPE html> <html> <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 + ";path=/"; } function getCookie(cname) { var name = cname + "="; var decodedCookie = decodeURIComponent(document.cookie); var ca = decodedCookie.split(';'); for(var i = 0; i < ca.length; i++) { var c = ca[i]; while (c.charAt(0) == ' ') { c = c.substring(1); } if (c.indexOf(name) == 0) { return c.substring(name.length, c.length); } } return ""; } function checkCookie() { var user=getCookie("username"); if (user != "") { alert("再次欢迎您，" + user); } else { user = prompt("请输入姓名：",""); if (user != "" && user != null) { setCookie("username", user, 30); } } } </script> </head> <body onload="checkCookie()"></body> </html>