使用関数:function,promptは計算機の4則の遠算を書きます
html>
<script type="text/javascript">
function d(){
var num1=parseInt(prompt(" :"));
var num2=parseInt(prompt(" :"));
var num=prompt(" :");
var score;
switch (num){
case "+":
score=num1+num2;
break;
case "-":
score=num1-num2;
break;
case "*":
score=num1*num2;
break;
case "/":
score=num1/num2;
break;
default:
}
alert(num1+num+num2+'='+score);
}
</script>
<input type="button" value=" "/>
</code></pre></div></div></div></div>