JavaScript 制作计算器计算器@慕课网原创_慕课网

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<body>

</body>
<script>
    var num1=prompt("请输入一个数：");
    var fu=prompt("请输入运算符");
    var num2=prompt("请再输入一个数：");

    switch(fu){
        case "+":
            alert(num1+"加上"+num2+"="+(parseFloat(num1)+parseFloat(num2)));
            break;
        case "-":
            alert(num1+"减去"+num2+"="+(parseFloat(num1)-parseFloat(num2)));
            break;
        case "*":
            alert(num1+"乘以"+num2+"="+parseFloat(num1)*parseFloat(num2));
            break;
        case "/":
            alert(num1+"除以"+num2+"="+parseFloat(num1)/parseFloat(num2));
            break;
        default:
            alert("你的操作有误！");
            break;
    }
</script>
</html>