Js new analytic process

fucntion Animal(name){
 this.name = name;
}
Animal.size = "middle";
Animal.property.say = function(){
  console.log(this.name + 'say');
}

var cat = new Animal('coco');　　

　　Animal embodiment the code was originally a regular function, when we use new line of code in the last time, this time is the Animal constructor;

 After 1.new method inherits the properties of the prototype chain;

 Example 2. a constructor;

 

In addition instanceof principle:

console.log(cat instanceof Animal);

// var L = cat.__proto__;
// var R = Animal.prototype;
// if(L === R)
//     return true;