(/* @IIFE */ function () {
    var num1 = dialogs.input('请输入第一个数字');
    var op = dialogs.singleChoice('请选择运算', [ '加', '减', '乘', '除', '幂' ]);
    var num2 = dialogs.input('请输入第二个数字');
    var result = 0;
    switch (op) {
        case 0:
            result = num1 + num2;
            break;
        case 1:
            result = num1 - num2;
            break;
        case 2:
            result = num1 * num2;
            break;
        case 3:
            result = num1 / num2;
            break;
        case 4:
            result = Math.pow(num1, num2);
            break;
    }
    alert('运算结果', result);
})();
