一直都是简单去js实现cookie的一些操作，今天把js对cookie操作系统的整理了一遍，包括：js读取cookie，js添加cookie，js删除cookie。示例如下：

<!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01//EN” “http://www.w3.org/TR/html4/strict.dtd”>
<html>
<head>
<meta http-equiv=”Content-Type” content=”text/html; charset=GB2312″ />
<title>cookie处理函数练习(为我所写，非我所想:改善面向对象)</title>
<script language=”JavaScript” type=”text/javascript”>
    function addCookie(objName,objValue,objHours){//添加cookie
        var str = objName + “=” + escape(objValue);
        if(objHours > 0){//为0时不设定过期时间，浏览器关闭时cookie自动消失
        var date = new Date();
            var ms = objHours*3600*1000;
            date.setTime(date.getTime() + ms);
            str += “; expires=” + date.toGMTString();
        }
        document.cookie = str;
        alert(“添加cookie成功”);
    }

    function getCookie(objName){//获取指定名称的cookie的值
        var arrStr = document.cookie.split(“; “);
        for(var i = 0;i < arrStr.length;i ++){
            var temp = arrStr[i].split(“=”);
            if(temp[0] == objName) return unescape(temp[1]);
        }
    }

    function delCookie(name){//为了删除指定名称的cookie，可以将其过期时间设定为一个过去的时间
        var date = new Date();
        date.setTime(date.getTime() – 10000);
        document.cookie = name + “=a; expires=” + date.toGMTString();
    }

    function allCookie(){//读取所有保存的cookie字符串
        var str = document.cookie;
        if(str == “”){
            str = “没有保存任何cookie”;
        }
        alert(str);
    }

    function $(m,n){
        return document.forms[m].elements[n].value;
    }

    function add_(){
        var cookie_name = $(“myform”,”cookie_name”);
        var cookie_value = $(“myform”,”cookie_value”);
        var cookie_expireHours = $(“myform”,”cookie_expiresHours”);
        addCookie(cookie_name,cookie_value,cookie_expireHours);
    }

    function get_(){
        var cookie_name = $(“myform”,”cookie_name”);
        var cookie_value = getCookie(cookie_name);
        alert(cookie_value);
    }

    function del_(){
        var cookie_name = $(“myform”,”cookie_name”);
        delCookie(cookie_name);
        alert(“删除成功”);
    }
</script>
</head>
<body>
<form name=”myform”>
<div><label for=”cookie_name”>名称</label><input type=”text” name=”cookie_name” /></div>
<div><label for=”cookie_value”>值</lable><input type=”text” name=”cookie_value” /></div>
<div><label for=”cookie_expireHours”>多少个小时过期</lable><input type=”text” name=”cookie_expiresHours” /></div>
<div>
<input type=”button” value=”添加该cookie” onclick=”add_()” />
<input type=”button” value=”读取所有cookie” onclick=”allCookie()” />
<input type=”button” value=”读取该名称cookie” onclick=”get_()” />
<input type=”button” value=”删除该名称cookie” onclick=”del_()” />
</div>
</form>
<hr />
</body>
</html>

来源：http://blog.csdn.net/baogreat/archive/2007/11/15/1887401.aspx