hashtag.html

<script src='https://code.jquery.com/jquery-1.11.1.min.js'></script>
<script>
    function getjs(){
        $.getJSON("hashtag.json", function(data) {
            console.log(data.total); // this will show the info it in firebug console
        });
    }
</script>

<button onclick="getjs()">Test</button>

hashtag.json

{"total" : "101010102"}