JSFiddle - React, Tailwind, and code Playground

HTML

<input type="button" id="test" value="Ping these!"/>
<table>
    <tr><td id="siteUCSC" rowspan="3"><a href="http://www.downforeveryoneorjustme.com/http://genome.ucsc.edu/">UCSC</a></td>
        <td>US</td>
        <td><div id="statusUS" value="http://128.114.119.137"></div></td>
    </tr>
    <tr>
        <td>Europe</td>
        <td><div id="statusEU" value="http://192.38.44.238"></div></td>
    </tr>
    <tr>
        <td>Cornell University</td>
        <td><div id="statusCU" value="132.236.82.88"></div></td>
        <!--http://genome-mirror.bscb.cornell.edu/-->
    </tr>
</table>

JavaScript

$("#test").click(function(){
    //Pinger_ping("128.114.119.137"); //http://genome.ucsc.edu/
    
    var best_ping = 999;
    $("div").each( function(){
        var msg = this.id;
        var ip = $(this).attr("value");
        var avg = 0;
        var cpt = 0;
        var i=0;
        for(i=0; i<10;i++){
            var ping = $.now();   
            $.ajax({ type: "HEAD",
                    url: ip,
                    cache:false,
                    complete: function(output){ 
                        ping = $.now() - ping;
                        
                        if (ping < 1000) { // 1 times out of 2, the diff is not computed
                            cpt++;
                            avg+= ping/cpt - avg/cpt; //update average val
                            $("#"+msg).text(avg+" ms (on "+cpt+"tests)");
                            $("#"+msg).trigger('change')
                            if(avg < 200) {
                                $("#"+msg).css({"color": "green"});
                            } else if (avg < 500) {
                                $("#"+msg).css({"color": "orange"});
                            } else {
                                $("#"+msg).css({"color": "red"});
                            }                 
                            
                            if(best_ping > avg) {
                                best_ping = avg;               
                                $("#siteUCSC a").attr("href",ip);
                            }                            
                       }
                   }
             });
        }        
    });
});