請參考上圖，設計 javascript 網頁，來執行組合運算
例如，m = 4，n = 2，組合運算 = m! / (n!*(m-n)!) = 6
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>40741157</title>
<script>
function C(){
let n1=document.getElementById("a").value;
let n2=document.getElementById("b").value;
let s1=1;
let s2=1;
let s3=1;
let n3=n1-n2;
for(i=1;i<=n1;i++){
s1=s1*i;
}
for(j=1;j<=n2;j++){
s2=s2*j;
}
for(i=1;i<=n3;i++){
s3=s3*i;
}
x=s1/(s2*s3);
document.getElementById("y").innerHTML=x;
}
</script>
</head>
<body>
<table width="100" height="200" border="1" align="center">
<tr>
<td align="center"><input id="a" type="text" size="5" maxlength="3" /><br><br>
<input id="b" type="text" size="5" maxlength="3" /><br><br>
<button type="button" onclick="C()">執行</button><br><br>
<output id="y"></td>
</tr>
</table>
</body>
</html>
網頁結果呈現如下圖
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