javascript - Object.define can monitor object changes, how to monitor basic type variables

Question

var obj = {};

Object.defineProperty(obj, "name", {
    get : function(){ return this._name;},
    set: function(val){  this._name = val;}
});

How to monitor the string variable changes of var string="a"?

Answer 1

Object.defineProperty(window, "mystring", {
    get : function(){ console.log("get");return this._name;},
    set: function(val){  console.log("set");this._name = val;}
});