How can I add a key/value pair to a JavaScript object?

Question

Here is my object literal:

var obj = {key1: value1, key2: value2};

How can I add field key3 with value3 to the ob

Answer 1

You can create a class with the answer of @Ionuț G. Stan

function obj(){
    obj=new Object();
    this.add=function(key,value){
        obj[""+key+""]=value;
    }
    this.obj=obj
}

Creating a new object with the last class:

my_obj=new obj();
my_obj.add('key1', 'value1');
my_obj.add('key2', 'value2');
my_obj.add('key3','value3');

Printing the object

console.log(my_obj.obj) // Return {key1: "value1", key2: "value2", key3: "value3"} 

Printing a Key

console.log(my_obj.obj["key3"]) //Return value3

I'm newbie in javascript, comments are welcome. Works for me.