功能完成后调用ajax更新

Question

我在同一页面中有以下javascript和ajax函数 - 我希望在第一个函数被激活并完成时激活ajax dis（）函数

<script src="//code.jquery.com/jquery.js"></script>
<script type="text/javascript">

    function addStock(event) {
        var element = event.target;
        var symbol = element.getAttribute("symbol");

        if (confirm("Add Symbol to Watchlist " + symbol + "?")) {
            $.post("watchlistinsert.php?symbol="+ symbol");
            console.log("item " + symbol + " added");

           //Here i want to call the function dis()

        } else {

            console.log("user canceled");
        }
        return;
    }


</script>

function dis()
{

    xmlhttp=new XMLHttpRequest();
    xmlhttp.open("GET", "select.php",false);
    xmlhttp.send(null);
    document.getElementById("getdata").innerHTML=xmlhttp.responseText;
}

dis();

setInterval(function(){
    dis();
},10000);