亂數分類的script

Script 要亂數選取，關鍵字是撲克牌亂數發牌，就可以找到類似的語法。


<p>
<button id="b1" class="myButton"></button>
<button id="b2" class="myButton"></button>
<button id="b3" class="myButton"></button>
<button id="b4" class="myButton"></button>
</p>

<script>
var a = new Array("①", "②", "③", "④");
function shuffle(a,b) {
  var num = Math.random() > 0.5 ? -1:1;
  return num;
}
var b = a.sort(shuffle);
//b是亂數排列過後的答案選項
document.getElementById("b1").innerHTML = b[0];
document.getElementById("b2").innerHTML = b[1];
document.getElementById("b3").innerHTML = b[2];
document.getElementById("b4").innerHTML = b[3];
</script>