Emoji Rendering Issue after posting a Newsfeed

Question

On posting my newsfeed message including unicodes of images e.g. \\ud83d\\ude01\\ud83d\\ude06\\ud83d\\ude03\\ud83d\\ude04test, it displays \�\�\�\�\�\�\�\�test . I am using 'Emojione' javascript library for converting the unicode to Image."

After calling ajax, I render newsfeed data by converting the unicode data by calling function unescapeUnicode(emojiRegExp)

function unescapeUnicode( str ) {
    return str.replace( /\\u([a-fA-F0-9]{4})/g, function(g, m1) {
         return String.fromCharCode(parseInt(m1, 16));
    });
}

I expect the output 'test', but the actual output is '"\�\�\�\�\�\�\�\�test"'