js操作cookie函数

function setCookies(sName,sValue,oExpires,sPath,sDomain,bSecure){
    var sCookie=sName+"="+ encodeURIComponent(sValue);
    if(oExpires){
        sCookie+="; expires="+oExpires.toGMTString();
    }
    if(sPath){
        sCookie+=";path="+sPath;        
    }
    if(sDomain){
        sCookie+=";domain="+sDomain;
    }
    if(bSecure){
        sCookie+=";secure";
    }
    document.cookie=sCookie;
}

function getCookie(sName){
    var sRE="(?:;)?"+sName+"=([^;]*);?";
    var oRE=new RegExp(sRE);
    if(oRE.test(document.cookie)){
        return decodeURIComponent(RegExp["$1"]);
    }
    else{
        return null;
    }
}

function deleteCookie(sName,sPath,sDomain){
    setCookies(sName,"",new Date(0),sPath,sDomain);
}