我如何获得原始值的参考？

Question

var number = 12345;

var obj = {};

do something like

obj.look    ((((((some operator or function to get a reference of number )))))      number

anyway, let's think now obj has a reference to number.
so I would like to wanna do it this way.

obj.look = 'abc';

console.log (number); // hopefully  'abc'

i would like it's gonna be:

1. not method ( like obj.look() )

2. but can refer in property ( like obj.look )

   all I'm asking is how to get a reference of primitive value.
   I believe there must be some way. please help me out.

Answer 1

You can use Object.defineProperty :

 var number = 12345; var obj = {}; Object.defineProperty(obj, 'look', { get() { return number; }, set(value) { number = value; } }); document.write(obj.look + '<br>'); obj.look = 'abc'; document.write(number); 

Answer 2

You can have an object, copy that reference to another variable, mutate the object and since both variables hold a reference to the same object any changes done from one variable will also be accessible from the other variable.

Primitive values can be wrapped into objects ( new Object ) but they can not be referenced otherwise. String objects are immutable (all properties are non-configurable, non-writable) and Number objects values are not accessible either. So you can't change the value of either object.

That means when you do:

obj.look = 'abc';

You are wiping the old reference and setting up a new string there (object or primitive). number will still hold the old reference and will remain unchanged.

So, no. I don't think this is possible to do in Javascript.