Membuat Looping JS (Bintang Lima)

Oke langsung ke script

<script type="text/javascript">
function abc(){
var jum=5;
var abc=document.getElementById("hasil");
for(var i=0; i<jum; i++){
abc.innerHTML+="*";
for(a=0; a<i; a++){
abc.innerHTML+="*";
}
abc.innerHTML+="<br>";
}
}
</script>
<button onclick="abc()">cek1</button>
<div id="hasil"></div>

Mudah kan bro,