<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Dogadd2</title> <script> function Dog(name, breed, weight){ this.name = name; this.breed = breed; this.weight = weight; } Dog.prototype.species = "Canine"; Dog.prototype.bark = function(){ if (this.weight > 25){ console.log(this.name + " Woof"); } else { console.log(this.name + " Yip!") } }; Dog.prototype.sitting = false; Dog.prototype.sit = function(){ if (this.sitting){ console.log(this.name + " is already sitting"); } else { this.sitting = true; console.log(this.name + " is start sitting"); } }; var fido = new Dog("fido", "mixed", 38); var barnaby = new Dog("Barnaby", "Basset", 55); //构造继承小狗原型的表演犬原型 function ShowDog(name, breed, weight, handler){ //调用dog.call传入参数 Dog.call(this, name, breed, weight); this.handler = handler; } ShowDog.prototype = new Dog(); //constructor显式的设置构造函数 ShowDog.prototype.constructor = ShowDog; ShowDog.prototype.league = "Webville"; ShowDog.prototype.stack = function(){ console.log("Stack"); }; ShowDog.prototype.bait = function(){ console.log("Bait"); }; ShowDog.prototype.gait = function(){ console.log(kind + " ing"); }; ShowDog.prototype.groom = function(){ console.log("Groom"); }; var scotty = new ShowDog("Scotty", "Scottish Terrier", 35, "Cookie"); scotty.bark(); scotty.bait(); </script> </head> <body> </body> </html>