JavaScrip操作Cookie

//生成cookie

function addCookie(sName, sValue, day) {

    var expireDate = new Date();

    expireDate.setDate(expireDate.getDate() + day);

    //设置失效时间 

    document.cookie = escape(sName) + '=' + escape(sValue) + ';expires=' + expireDate.toGMTString()+';path=/';



}

//读取sid

function getCookie(cookieName) {

    if (document.cookie.length > 0) {

        var cStart = document.cookie.indexOf(cookieName + "=");

        if (cStart != -1) {

            cStart = cStart + cookieName.length + 1;

            var cEnd = document.cookie.indexOf(";", cStart);

            if (cEnd == -1)

                cEnd = document.cookie.length;

            return unescape(document.cookie.substring(cStart, cEnd));

        }

    }

    return "";

}