node_inheritance.js

var util = require("util");
 
var obj1 = function () {
    this.color = "green";
    this.type = "suv";
};
 
obj1.prototype.demo = 123;
 
var obj2 = function () {
    obj1.call(this);
    this.name = "yuki";
};
 
util.inherits(obj2, obj1);
 
console.log(new obj2().color);