日期:2014-05-16  浏览次数:20299 次

javascript实现cookie
<html>
    <head>
        <script type="text/javascript">
            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 ""
            }

            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())
            }

            function checkCookie()
            {
                username=getCookie('username')
                if (username!=null && username!="")
                {alert('Welcome again '+username+'!')}
                else 
                {
                    username=prompt('Please enter your name:',"")
                    if (username!=null && username!="")
                    {
                        setCookie('username',username,365)
                    }
                }
            }
        </script>
    </head>

    <body onLoad="checkCookie()">
    </body>
</html>