javascript - 我的 javascript 函数出现函数未定义错误

Question

我正在尝试根据 8 位输入来计算一个人的年龄。当我尝试运行代码时，它显示 TypeError undefined is not a function..

var calcAge = function (dob) {

    var age,

        mm = dob.substring(0, 2),
        dd = dob.substring(2, 4),
        yyyy = dob.substring(4, 8),
        d = new Date(),
        currentDay = d.getDay,
        currentMonth = (d.getMonth() + 1) < 10 ? "0" + (d.getMonth() + 1) : d.getMonth() + 1,
        currentYear = d.getFullYear;


        if (parseInt("" + mm + dd) >= parseInt("" + currentMonth + currentDay)) {
            age = currentYear - yyyy;
        } else {
            age = (currentYear - yyyy) - 1;
        };

        return age;
};

Answer 1

d.getDay() 和 d.getFullYear() 是函数而不是字符串值，您使用的是返回星期几的 getDay() 而不是 getDate()，并且您的最终测试有点偏差。

var calcAge = function (dob) {
var age,
    mm = dob.substring(0, 2),
    dd = dob.substring(2, 4),
    yyyy = dob.substring(4, 8),
    d = new Date(),
    currentDay = d.getDate(),
    currentMonth = (d.getMonth() + 1) < 10 ? "0" + (d.getMonth() + 1) : d.getMonth() + 1,
    currentYear = d.getFullYear();
    if (parseInt("" + mm + dd) <= parseInt("" + currentMonth + currentDay)) {
        age = currentYear - yyyy;
    } else {
        age = (currentYear - yyyy) - 1;
    };
    return age || false;
};

使用这些测试现在看来是正确的 calcAge('02191964');//返回51 calcAge('02201964');//51 calcAge('02211964');//50