Question

我刚刚恢复功能而没有计算，出了什么问题？我无法弄清楚这一点......这太烦人了

<script type="text/javascript">
    function Human(age, name, lastname) {
        this.age = age;
        this.name = name;
        this.lastname = lastname;
        this.born = born;
    }
    function born() {
        var currentyear = 2015;
        var born = this.age - currentyear;
    return born;
    }

    var asaf = new Human(16,"Asaf","shlush");
    var daniel = new Human(19 , "Daniel" , "Bivas");

    document.write(asaf.born);

Answer 1

您需要调用方法document.write(asaf.born());

Answer 2

天生的功能应该在人类声明中。

function Human(age, name, lastname) {
    this.age = age;
    this.name = name;
    this.lastname = lastname;

    this.born = function () {
        var currentyear = 2015;
        var born = this.age - currentyear;
        return born;
    }
}


var asaf = new Human(16,"Asaf","shlush");
var daniel = new Human(19 , "Daniel" , "Bivas");

document.write(asaf.born());

请注意最后一行中函数调用的括号。

Answer 3

问题是born对象上没有定义函数Human。

试试这个：

 function Human(age, name, lastname) {
    this.age = age;
    this.name = name;
    this.lastname = lastname;
    this.born = function(){
        return 2015 - this.age;
    };
};

var asaf = new Human(16,"Asaf","shlush");
asaf.born() // 1999

Answer 4

您实际上需要调用该函数：asaf.born()。

您也可以考虑将born添加为Human原型的方法。你得到了相同的结果，但它可能是更好的练习。类似的东西：

function Human(age, name, lastname) {
    this.age = age;
    this.name = name;
    this.lastname = lastname;
}

Human.prototype.wasBorn = function () {
    var currentyear = 2015;
    var born = this.age - currentyear;
    return born;
}

Here you can see both results working.

Answer 5

您只需在javascript代码中编写调试器，然后在浏览器中使用inspect element console屏幕打开它，然后刷新它，然后在浏览器中调试您的javascript代码，就可以自行检查。

您可以简单地检查哪些功能可以调用，哪些功能不可以。您还可以检查那里所有元素的值。所以，你可以检查if函数是否返回born的值？

Javascript代码，没有弄清楚是什么错

5 个答案: