<script type="text/javascript"> var username = "imooc"; var userid = 85; var email = "12345678@imooc.com"; document.cookie="username="+username; document.cookie="userid="+userid; document.cookie="email="+email; function getCookie(key){ var cookieArr = document.cookie.split(";"); for(var index=0;index<cookieArr.length;index++){ var arr = cookieArr[index].split("="); if(arr[0]==key){ return unescape(arr[1]); } } } alert(getCookie("userid")); </script>當(dāng)alert(getCookie("username"))的時候能夠彈出imooc，但是想得到userid的值的時候卻得到的是undefined。JS新手上路，希望能夠得到解答。