js读取、写入、删除cookies

【核心代码】

//дcookie
function _addCookie(keyword, distinct, url) {

    keyword = _allSearchHtmlEncode(keyword);
    var thisCookieKey = keyword   "#--"   distinct;
    var thisCookie = keyword   "#--"   distinct   "#=="   url;

    var cookie = _readCookie();
    if (cookie != null) {
        var cookies = cookie.split("#&&");
    } else {
        var cookies = new Array();
    }

    for (var c = 0; c < cookies.length; c  ) {
        var cookieKey = cookies[c].split("#==");
        if (cookieKey.length > 1) {
            if (cookieKey[0] == thisCookieKey) {
                return;
            }
        }
    }
    if (cookies.length == 5) {
        cookies.shift();
    }
    cookies.push(thisCookie);

    var result = cookies.join("#&&");
    var str = "SearchHistoryWordHPGlobal"   "="   escape(result);

    localStorage.setItem("SearchHistoryWordHPGlobal", str);
}

function _readCookie() {

    var all = localStorage.getItem("SearchHistoryWordHPGlobal");
    if (!all || all == "") {
        return null;
    }
    var value = unescape(all.split('SearchHistoryWordHPGlobal=')[1]); return value;

}

function _deleteCookie(e) {
    // alert(this);
    var cookie = _readCookie();
    var kword = e.currentTarget.parentElement.getAttribute('keyword');
    var kdis = e.currentTarget.parentElement.getAttribute('dis');
    var word = kword   '#--'   kdis;
    try {
        if (cookie != null) {
            var cookies = cookie.split("#&&");
            for (var c = 0; c < cookies.length; c  ) {
                var cookieKey = cookies[c].split("#==");
                if (cookieKey[0] == word) {
                    cookies.splice(c, 1);
                }
            }
            if (cookies.length != 0) {
                var result = cookies.join("#&&");
                var str = "SearchHistoryWordHPGlobal="   escape(result);
                var date = new Date();
                var ms = 30 * 24 * 3600 * 1000;
                date.setTime(date.getTime()   ms);
                str  = "; expires="   date.toGMTString();
                document.cookie = str;
            } else {
                var date = new Date();
                date.setTime(date.getTime() - 10000);
                document.cookie = "SearchHistoryWordHPGlobal=a; expires="   date.toGMTString();
            }
        }
    } catch (ev) {
        //   alert(ev);
    } finally {
        cookie = _readCookie();
        if (cookie == null) {
            _hideHistory();
        } else {
            var cookies = cookie.split("#&&");
            if (cookies.length == 0) {
                _hideHistory();
            }
        }

        if (e && e.stopPropagation) {
            e.stopPropagation();
        } else {
            window.event.cancelBubble = true;
        }
        _historyResultDiv();
    }
}