<html>
<script>
var answer;
function radom()
{
answer="";
var n1 = Math.floor(Math.random()*10);
var n2 = Math.floor(Math.random()*10);
var n3 = Math.floor(Math.random()*10);
while(n2==n1)
n2 = Math.floor(Math.random()*10);
while((n3==n1)||(n3==n2))
n3 = Math.floor(Math.random()*10);
answer = n1+""+n2+""+n3;
document.write(answer);
}
</script>
<body>
<input type="button" value="亂數" onclick="radom()"/>
</body>
</html>
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