How do is use the SetInterval function and the 'if' to make div's pop up?

i have this script for a Whack a mole game, but i can't seem to make my div's pop up when I want them to by using a random number generator. This is my code:(by the way this is my first game I have ever made so it's pobably a stupid question :))

        //minigame
setInterval(function() {
var randomnumber = 1 + Math.floor(Math.random() * 10);  
            if (randomnumber = "1") {
                $('#mole1').show();
                };
            if (randomnumber = '2') {
                $('#mole1').show();
                };
            if (randomnumber = 3) {
                $('#mole1').show().delay(300).hide();
            };
            function mole4() {
            if (randomnumber = 4) {
                $('#mole1').show().delay(300).hide();
                };
            };
            function mole5() {
            if (randomnumber = 5) {
                $('#mole1').show().delay(300).hide();
                };
            };
            function mole6() {
            if (randomnumber = 6) {
                $('#mole1').show().delay(300).hide();
                };
            };          
}, 200);

and my html that's relevant:

            <div id="minigameblockholder">
        <div class='moles' id="mole1"> </div>
        <div class='moles' id="mole2"> </div>
        <div class='moles' id="mole3"> </div>
        <div class='moles' id="mole4"> </div>
        <div class='moles' id="mole5"> </div>
        <div class='moles' id="mole6"> </div>

        <div id="scorebord"> </div>

    </div>

I have not started working on my scoreboard yet so don't other correcting that. thanks in advnce, Jasper