Does Javascript equal sign reference objects or clones them?

问题

In MyApp.something.BigObject I have a memory expensive object and I like to do this var theObject = MyApp.something.BigObject;. My question is would that take up double the memory or not?

回答1:

The "equals sign" is the assignment operator. If the RHS is an object, then a reference is assigned to the LHS, it does not clone or copy the object.

So given:

var obj = {};
var b = obj;

both obj and b reference the same object.

来源：https://stackoverflow.com/questions/7467335/does-javascript-equal-sign-reference-objects-or-clones-them