Why parent window object Update by the child window in JavaScript?

Question

opener` in my child window by the parent window.

in my parent window code is

var a ={"test":""};
var b=a;

in my child window my code is

top.opener.b.test="set by child";

Now i close this child window

now when i see a.test it gives me set by child

i don't know when i update b why it is update in a

So How can I reset b by a

Please help me guys.

Thanks ...

http://stackoverflow.com/questions/518000/is-javascript-a-pass-by-reference-or-pass-by-value-language — adeneo, May 23 '14 at 11:42

score 2 · Accepted Answer · answered May 23 '14 at 11:40

2

Because b is not actually a copy of a, it is a reference to a. This means that when you reference b you're really referencing a.

answered May 23 '14 at 11:40

Jon Snow

then how can i pass copy of a in b – Rituraj ratan May 23 '14 at 11:41
This question has been answered a lot, this is the most popular answer: http://stackoverflow.com/questions/728360/most-elegant-way-to-clone-a-javascript-object Also different frameworks and libraries have methods of cloning an object. – Jon Snow May 23 '14 at 11:42

1 Answers1