是否可以全局访问原型变量

Question

function Person() {}

Person.prototype.getFullName = function(){
    var name = "John Micheal";
}

var p1 = new Person();
console.log(p1.getFullName());

Here I want to access the variable "name" to my other prototypes. Is this possible?

If not, Is there any other way to do ?

http://jsfiddle.net/KabeerRifaye/bcxqx1wj/

Thanks in advance.

Answer 1

You should probably go do some JavaScript tutorials. I recommend TreeHouse or CodeSchool.

Anyways, there are a few possible options / interpretations of your question.

If you're just trying to get the return value you need to use the return keyword. Now your console.log will output the name.

 function Person() {} Person.prototype.getFullName = function(){ var name = "John Micheal"; return name; } var p1 = new Person(); console.log(p1.getFullName());

If you truly want to share the value between functions you need to use the this keyword. In this example you can set the value in setName and retrieve it with getName .

 function Person() {} Person.prototype.getName = function(){ return this.name } Person.prototype.setName = function(newName) { this.name = newName } var p1 = new Person(); p1.setName('John'); console.log(p1.getName());

These are hard concepts to learn on your own. I really recommend working through some JavaScript tutorials to learn this fundamental concepts.

Answer 2

I updated your version => http://jsfiddle.net/bcxqx1wj/3/

I would highly recommend to use a more generic get function:

Person.prototype.getData = function(prop){
    if (this[prop] !== undefined) {
        return this[prop];
    } else {
        return false;
    }
}

Set function would look like this:

Person.prototype.setData = function(prop, data){
    this[prop] = data;
}