Does JS have name binding operations?

Question

I'm a newbie to js. Let me illustrate my question with a few examples.

Code 1

var temp = { key: "value" };
var data = ["v1", "v2"];
var result = [];
for (var i in data) {
    var newdata = temp; /** Note here! **/
    newdata.key = data[i];
    result.push(newdata);
}
console.log(result);
// [ { key: 'v2' }, { key: 'v2' } ]

The result here is unexpected.

Code 2

var temp = { key: "value" };
var data = ["v1", "v2"];
var result = [];
for (var i in data) {
    var newdata = { key: "value" }; /* Note here! */
    newdata.key = data[i];
    result.push(newdata);
}
console.log(result);
// [ { key: 'v1' }, { key: 'v2' } ]

Now the result is what I want.

It looks like the name binding operation in Python. But I googled a lot and could not get a satisfied answer. So I have to turn to stackoverflow for help.

My question:

Does JS have a name binding operation similar with Python? If not, why do these two piece of codes get different results?

[Edit]

I know about reference in C++, and name binding in Python. And I'm also aware of the differences between these two.

The only thing I was confused with was: In JS, is it reference or name binding? Or something else?

Thanks to all the comments, I totally understand it's similar with name binding rather than reference. (As I can't find any button to closed this question, I add the answer here.)