SOURCE

var M = function (name) { 
  this.name = name; 
}   //M是构造函数

var o3 = new M('o3') //o3是实例

console.log(o3)
console.log(o3.constructor)

var ar = [1,2,3]

console.log(ar.constructor)

console.log(ar.constructor === Array)


var ar2 = new Array(1,4,67,123213)
console.log(ar2)
console.log(ar2.constructor)
console.log('######')
console.log(ar2.constructor === ar2.__proto__.constructor )