javascript - Javascript 对象返回“未定义”

Question

大家好，我正在尝试使用 javascript/node.js 中的对象，实际上我很难处理其中包含函数的对象。这是我的示例代码，输出应该是：

罗汉 说：你好，世界

这是我的 func.js

var myObject = function(name) {
    console.log(this.name + ' says: ');
    this.talk = function(msg) {
        console.log(msg);
        }
};

var phil = function (name) {
    this.name = name;
};

phil.prototype = new myObject();
var man = new phil('Rohan');
man.talk('Hello World');

我希望你能帮助我在我的代码中解决这个问题。多谢你们。

Answer 1

请参阅正确的 javascript 继承。不要使用new关键字来创建原型（你不想像实例一样初始化它）。通过应用父构造函数来初始化实例。对于命名约定：大写构造函数会很好。

function MyObject() {
    console.log(this.name + ' got created');
}
MyObject.prototype.talk = function(msg) {
    console.log("and says "+msg);
};

function Phil(name) {
    this.name = name;
    MyObject.call(this);
}
Phil.prototype = Object.create(MyObject.prototype);

var man = new Phil('Rohan');
man.talk('Hello World');

Answer 2

var myObject = function(name) {
    this.talk = function(msg) {
        console.log(msg);
    },
    this.setName = function(name) {
        this.name = name;
        console.log(name + ' says: ');
    }
};

var phil = function (name) {
    this.setName(name);
};

phil.prototype = new myObject();
var man = new phil('Rohan');
man.talk('Hello World');

Answer 3

修改你的talk功能

this.talk = function (msg) {
    console.log(this.name + ' says: ' + msg);
}