根据指定名称获取Cookie

unction getCookieValue(name){  
        var name = escape(name);  //name为指定的名称
        var allcookies = document.cookie;  
        name += "=";  
        var pos = allcookies.indexOf(name);  
        if(pos != -1){  
            var start = pos + name.length;  
            var end = allcookies.indexOf(";",start);    
           //这里是根据;分隔符来分隔出该名称的值，如果在设置Cookie时用的是,分隔，请替换成相应符号。
            if(end == -1){  
                end = allcookies.length;  
            }  
            var value = allcookies.substring(start,end);  
            return unescape(value);  
        } else{  
            return "";  
        }  
    }  
unction getCookieValue(name){  
        var nam