js Object.defineProperty自动存档对象d

function Archiver() {
var temperature = null;
var archive = [];

Object.defineProperty(this, 'temperature', {

get: function() {
  console.log('get!');
  return temperature;
},
set: function(value) {
  temperature = value;
  archive.push({ val: temperature });
}

});

this.getArchive = function() { return archive; };
}

var arc = new Archiver();
arc.temperature; // 'get!'
arc.temperature = 11;
arc.temperature = 13;
arc.getArchive(); // [{ val: 11 }, { val: 13 }]