cookie的获取，设置和清空 setcookie&&个体cookie&&delcookie

转载至http://blog.sina.com.cn/s/blog_5d6c3a1f0100vtvh.html大神的作品。留着以后有用

//设置cookie

function setcookie(name,value){  

        var Days = 30;  

        var exp  = new Date();  

        exp.setTime(exp.getTime() + Days*24*60*60*1000);  

        document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();  

    }  

     

//getcookie方法

    function getcookie(name){  

        var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));  

        if(arr != null){  

            return (arr[2]);              

        }else{  

            return "";  

        }  

    } 

    //清空cookie方法

function delcookie(name){  

       var exp = new Date();  

       exp.setTime(exp.getTime() - 1);  

       var cval=getcookie(name);  

       if(cval!=null) document.cookie= name + "="+cval+";expires="+exp.toGMTString();  

    }