Object.define 可以监听object变化，那基本类型变量如何监听

Question

var obj = {};

Object.defineProperty(obj, "name", {

    get : function(){ return this._name;},

    set: function(val){  this._name = val;}

});

那如何监听 var string="a" 的string变量变化呢？

Answer 1

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