Cookie处理函数练习

【Javascript】

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javascrip添加cookie,javascrip删除cookie;javascrip取cookie值

<!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</title>
        <script language="JavaScript" type="text/javascript">
        var $=function(el){
            return (typeof el=='object')?el:document.getElementById(el);
        };        
       var addCookie=function(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");
        };        
        var getCookie=function(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]);
                }
            } 
        };        
        var delCookie=function(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();
            alert("删除成功");
        };        
        var add=function(){//添加Cookie
            var cookie_name = $("cookie_name").value;
            var cookie_value = $("cookie_value").value;
            var cookie_expireHours = $("cookie_expiresHours").value;
            if(cookie_name==""||cookie_value==""){
              alert("请填写完整Cookie的名称和值");
              return;
            }
            addCookie(cookie_name,cookie_value,cookie_expireHours);
        };
        var getall=function(){//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);
        };
        var get=function(){//读取单个该名称的cookie
            var cookie_name = $("cookie_name").value;
            var cookie_value = getCookie(cookie_name);
            if(cookie_name ==""){            
               alert("请填写名称，根据名称进行查找");
             return;
            }
            if(cookie_value==null){
              cookie_value="没有该名称的cookie";
            }            
            alert(cookie_value);
        };        
        var del=function(){//删除该名称的cookie
            var cookie_name = $("cookie_name").value;
            if(cookie_name==""){
              alert("请填写名称，根据名称进行删除");
              return;
            }            
            delCookie(cookie_name);            
        };
        </script>        
    </head>
    <body>
        <form name="myform">
            <div><label for="cookie_name">Cookie名称：</label><input type="text" name="cookie_name" /></div>
            <div><label for="cookie_value">Cookie &nbsp;值：</lable><input type="text" name="cookie_value" /></div>
            <div><label for="cookie_expireHours">过期时间(小时)：</lable><input type="text" name="cookie_expiresHours" /></div><hr/>
            <div>
                <input type="button" value="添加该cookie" onclick="add()" />
                <input type="button" value="读取所有cookie" onclick="getall()" />
                <input type="button" value="读取该名称cookie的值" onclick="get()" />
                <input type="button" value="删除该名称cookie" onclick="del()" />
            </div>
        </form>
        <hr />
    </body>
</html>