Js对中文字符串加密

function urlencode(text)
{
    text = escape(text.toString()).replace(/\+/g, "%2B");
    // this escapes 128 - 255, as JS uses the unicode code points for them.
    // This causes problems with submitting text via AJAX with the UTF-8 charset.
    var matches = text.match(/(%([0-9A-F]{2}))/gi);
    if (matches)
    {
        for (var matchid = 0; matchid < matches.length; matchid++)
        {
            var code = matches[matchid].substring(1,3);
            if (parseInt(code, 16) >= 128)
            {
                text = text.replace(matches[matchid], '%u00' + code);
            }
        }
    }
    text = text.replace('%25', '%u0025');
    return text;
}