cookie——创建、获取、删除 

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
    </head>
    <body>
    </body>
</html>
<script type="text/javascript">
    var date = new Date();
    date.setDate(date.getDate() + 5);
    //alert(date);
    /*
    document.cookie = "姓名=张三;expires=" + date + ";path=/";
    document.cookie = "url=www.1000phone.com;expires=" + date + ";path=/";
    document.cookie = "email=zhangsan@1000phone.com;expires=" + date + ";path=/";
    alert(document.cookie);
    */



    //封装一个创建cookie的方法
    function createCookie(key,value,expires,domain,secure){
        var cookieText = encodeURIComponent(key) + "=" + encodeURIComponent(value) + ";path=/";
        if(!isNaN(expires)){
            if(typeof expires == "number" && expires > 0){
                var date = new Date();
                date.setDate(date.getDate() + expires);
                cookieText += ";expires=" + date;
            }
        }
        if(domain){
            cookieText += ";domain=" + domain;
        }
        if(secure){
            cookieText += ";secure";
        }
        document.cookie = cookieText;
    }
    createCookie("姓名","张三",10);
    createCookie("url","www.1000phone.com",10);
    createCookie("email","zhangsan@1000phone.com",10);
    //alert(document.cookie);



    //封装一个获取cookie的方法


    //方法一：
　　//%E5%A7%93%E5%90%8D=%E5%BC%A0%E4%B8%89; url=www.1000phone.com; email=zhangsan%401000phone.com
    /*
     * 姓名=    0   张三
     * url=    39 www.1000phone.com
     * email zhangsan@1000phone.com
     * 
     * substring(start,end)
     * slice(start,end)
     * substr(start,length)
     */
    //alert(getCookieValue("email"));

    function getCookie(key){
        var keyText = encodeURIComponent(key) + "="
        var start = document.cookie.indexOf(keyText); //找到开始位置
        if(start != -1){
            var end = document.cookie.indexOf(";",start); //找到结束位置
            if(end == -1){
                end = document.cookie.length;
            }
            var cookieValue = decodeURIComponent(document.cookie.substring(start + keyText.length,end));
        }
        return cookieValue;
    }
    
    //方法二
    function getCookieValue(key){
        var arr = document.cookie.split("; ");
        //["%E5%A7%93%E5%90%8D=%E5%BC%A0%E4%B8%89","url=www.1000phone.com","email=zhangsan%401000phone.com"]
        for(var i = 0; i < arr.length; i ++){
            var list = arr[i].split("=");
            //["%E5%A7%93%E5%90%8D","%E5%BC%A0%E4%B8%89"]
            //["url","www.1000phone.com"]
            //["email","zhangsan%401000phone.com"]
            if(list[0] == encodeURIComponent(key)){
                break;
                return decodeURIComponent(list[1]);
                
            }
        }
    }

    //封装一个删除cookie的方法
    function removeCookie(key){
        document.cookie = key + "=;expires=" + new Date(0) + ";path=/";
    }
    removeCookie("url");
    alert(getCookieValue("url"));

</script>

 

posted @ 2017-08-13 15:25  LLLLily  阅读(510)  评论(0)  编辑  收藏  举报