Javascript中的Cookie操作

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title></title>
    <script type="text/javascript">
        //添加cookie
        function setCookie(key, value, delay) {
            var oDate = new Date();
            oDate.setDate(oDate.getDate() + delay);//设置过期时间
            document.cookie = key + "=" + value + ";expires=" + oDate;
        }

        setCookie("name", "hahah", 13);
        setCookie("pwd", "sdfsf", 234);
        //删除cookie
        function removeCookie(key){
            setCookie(key,1,-1);
        }
    </script>
</head>
<body>
</body>
</html>

　　//本域内设置cookie

<script type="text/javascript">
function setCookie(c_name,value,expiredays) {
var exdate=new Date();
exdate.setDate(exdate.getDate()+expiredays);
document.cookie=c_name+ "=" +escape(value)+((expiredays==null) ? "" : ";expires="+exdate.toGMTString())+";path=/;domain=b.com";
}
window.onload=function(){
setCookie("listallwjh","sfwjh");
alert("Cookie设置成功！");
}
</script>

　　跨域设置cookie

<script>
function getCookie(c_name) {
if (document.cookie.length>0)
{
c_start=document.cookie.indexOf(c_name + "=");
if (c_start!=-1)
{
c_start=c_start + c_name.length+1 ;
c_end=document.cookie.indexOf(";",c_start);
if (c_end==-1) c_end=document.cookie.length;
return unescape(document.cookie.substring(c_start,c_end));
}
}
return "";
}
window.onload=function(){
var c_name="listallwjh";
if(getCookie("listallwjh")!=null){
alert(getCookie("listallwjh"));
}
}
</script>

　　//读取Cookie

 //读取cookie
        function getCookie(key) {
            var arr = document.cookie.split(";");
            for (var i = 0; i < arr.length; i++) {
                var arr2 = arr[i].split("=");
                if (arr2[0]==key) {
                    return arr2[1];
                }
            }
        }