javascript copy of object not reference code example
Example: javascript copy an object without reference
var obj = {a: 25, b: 50, c: 75};
var A = Object.create(obj);
var B = Object.create(obj);
A.a = 30;
B.a = 40;
alert(obj.a + " " + A.a + " " + B.a); // 25 30 40