js创建对象的四种方式以及消耗时间比较

// Property-less object 
console.time(‘zoop1‘);
var zoop = (function (numObjects) {
  var pooz = Object.create(null);
  for(var i = 0; i< numObjects; i++) {
    pooz[i] = Object.create(null);
  }
  return pooz;
})(1000000);
console.timeEnd(‘zoop1‘);
 
// Using Object Literal
console.time(‘zoop2‘);
var zoop = (function (numObjects) {
  var pooz = {};
  for(var i = 0; i< numObjects; i++) {
    pooz[i] = {};
  }
  return pooz;
})(1000000);
console.timeEnd(‘zoop2‘);
 
// Object.create({})
console.time(‘zoop3‘);
var zoop = (function (numObjects) {
  var pooz = Object.create({});
  for(var i = 0; i< numObjects; i++) {
    pooz[i] = Object.create({});
  }
  return pooz;
})(1000000);
console.timeEnd(‘zoop3‘);
 
// new Object
console.time(‘zoop4‘);
var zoop = (function (numObjects) {
  var pooz = new Object();
  for(var i = 0; i< numObjects; i++) {
    pooz[i] = new Object();
  }
  return pooz;
})(1000000);
console.timeEnd(‘zoop4‘);
来源：https://gist.github.com/shubhadeep/371f9245656d5937af09