how to read a object in javascript code example

Example 1: javascript object

var	person = {
	first_name : "Marty",
  	last_name : "Mcfly",
	born : 1968,
	died : 1933,
    lovers: ["Jennifer Parker","Baines McFly"]
};

Example 2: js obj

var obj = {my:"sql",  nice:[69, 420]};

obj.my //returns the string "sql"
obj.nice //returns the array [69, 420]