为什么我无法访问通过对象的方法创建的对象

Question

Let's say i have this code:

var m = 
{
    init: function(num, num2, num3)
    {
        this.num = num;
        this.num2 = num2;
        this.num3 = num3;
    }
};

var t = 
{
    create: function()
    {
        var obj = Object.create(m);
        obj.init(1,2,3);
    }

};

t.create();
console.log(obj)

When executing this code i get this error:

obj is not defined

How can I make obj work outside the method create ?

Answer 1

Change your create function to return the obj . Then, you can do var obj = t.create() .

Here is the complete code:

var m = 
{
    init: function(num, num2, num3)
    {
        this.num = num;
        this.num2 = num2;
        this.num3 = num3;
    }
};

var t = 
{
    create: function()
    {
        var obj = Object.create(m);
        obj.init(1,2,3);
        return obj;
    }

};

var obj = t.create();
console.log(obj)

Answer 2

obj is a local variable to the function create. You need to return it to provide access to it outside of that function.

var t = 
{
    create: function()
    {
        var obj = Object.create(m);
        obj.init(1,2,3);
        return obj;
    }

};

var obj = t.create();
console.log(obj)

Answer 3

Returning the object created would solve your issue. The obj is a local variable bound to the scope of the create function you cannot access it outside.

var m = 
{
    init: function(num, num2, num3)
    {
        this.num = num;
        this.num2 = num2;
        this.num3 = num3;
    }
};

var t = 
{
    create: function()
    {
        var obj = Object.create(m);
        obj.init(1,2,3);
        return obj;
    }

};
let obj = t.create();
console.log(obj);