javascript构造函数

class.js

function createObj(nick,age){
  var obj = {
    nick:nick,
    age:age,
    printName:function(){
      console.log(this.nick);
    }
  }
  return obj;
}

var obj1 = createObj('yang', 20);
obj1.printName();

///////////////////////
function cat(name){
  this.name = name;
}

cat.prototype.say = function(){
  console.log('hello, ' + this.name)
}

var C = new cat('yang')
C.say()