SOURCE

(function() {
    'use strict';
    // Your code here...
    var dictionary= {
        "you":"bbbbbb",
        "store":"aaaaaa",
        "about":"fast",
        "Find":"on way",
        "this":"gogogo"
    };
    $('#go').click(highlight);

    function highlight(){
        var NewWords = dictionary[1];
        var FindWords = new RegExp(NewWords,'g');
        $('span').each(function(){
            var html = $(this).html();
            var newHtml = html.replace(FindWords,NewWords);
            $(this).html(newHtml);
        });
    };
})();

<h1>this is a demo</h1>
<p>oh, this man is so cool!</p>
<span>haa,it's sooo~ cooool~, <a id="go">I like this man</a></span>

body{
    color: #fff;
}
p{
    color: #a4a4a4;
}
a{
    color: #bfb;
}
a:hover{
    color: #ada;
    cursor: pointer;
}
#wavy{
     text-decoration-style: wavy;
}

#go{
    width: 100px;
    height: 30px;
}