先上个例子代码：
function Animal(name, sex) {
this.name = name;
this.sex = sex;
}
Animal.color = "black";
Animal.prototype.heartBeat = true;
Animal.prototype.say = function () {
console.log("My name is: " + this.name);
};
var cat = new Animal("cat", "female");
console.log("cat color: " + cat.color);
console.log("cat heartBeat: " + cat.heartBeat);
console.log("cat sex: " + cat.sex);
console.log("animal color: " + Animal.color);
console.log("animal heartBeat: " + Animal.heartBeat);
console.log("animal sex: " + Animal.sex);function Animal(name, se
