結果都是5

<script?type="text/javascript">

//定義函數
var?sum;
function?a1(a,b){
????
????if(a>b){
????????sum=a
????}
????else?if(a<b){
????????sun=b
????}
????else?{
????????sum=b
????}
????return?sum;
?
}

??document.write("?5?和?4?的較大值是:"+a1(5,4)+"<br>");
?
??document.write("?3?和?6?的較大值是:"+a1(3,6));?




</script>