Change unicode Emojis to UTF-32 code.

replaceEmojis-demo.html

<div id="emojiReplaceDemo"></div>

<script type="text/javascript">
(function($) {

    $(document).ready(function() {
        var content = searchEmojis("🙊", function(match) {
            return '<img class="emojioneemoji" src="https://cdnjs.cloudflare.com/ajax/libs/emojione/2.1.4/assets/png/'+ uni2utf32(match) +'.png" alt="'+ match +'" />';
        });

        $('#emojiReplaceDemo').html(content);
    });

})(jQuery);
</script>

replaceEmojis.js

/* ReplaceEmojis @icetee - https://gist.github.com/icetee/b7f69ed4814280ebf263760c6873eb25 | MIT */
function uni2utf32(str) {
    var utf16 = [],
        utf32 = "";

    for (var i = 0; i < str.length; i++) {
      utf16.push( ('0x' + str.charCodeAt(i).toString(16).toUpperCase()) - 0 );
    }

    utf32 = (utf16[0] - 0xD800) * 0x400 + utf16[1] - 0xDC00 + 0x10000;

    return utf32.toString(16);
}

function searchEmojis(str, cb) {
    if (!str) str = '';

    var pattern = /([\uD800-\uDBFF][\uDC00-\uDFFF])/g,
        is_matched = str.match(pattern);

    if (typeof cb !== 'function' || !is_matched) return str;

    return str.replace(pattern, function (match) {
        return cb(match);
    });
}

replaceEmojis.min.js

/* ReplaceEmojis @icetee - https://gist.github.com/icetee/b7f69ed4814280ebf263760c6873eb25 | MIT */
function uni2utf32(d){var a=[],c="";for(var b=0;b<d.length;b++){a.push(("0x"+d.charCodeAt(b).toString(16).toUpperCase())-0)}c=(a[0]-55296)*1024+a[1]-56320+65536;return c.toString(16)}function searchEmojis(d,a){if(!d){d=""}var c=/([\uD800-\uDBFF][\uDC00-\uDFFF])/g,b=d.match(c);if(typeof a!=="function"||!b){return d}return d.replace(c,function(e){return a(e)})};