How can I copy the array without changing the original array value?

```
var arr1 = [];
var arr2 = [];

arr1 = [{price: 10},{price: 20}];

console.log(arr1);

arr2[0] = arr1[0];
arr2[0].price += 5;

console.log(arr2);

//output arr1 = [{price: 15},{price: 20}]; Why???
//output arr2 = [{price: 15}];

```