建立和初始化 Prototype
var Human = function() {
this.canWalk = true;
this.canSpeak = true; //
};
Person.prototype.greet = function() {
if (this.canSpeak) { // checks whether this prototype has instance of speak
this.name = "Steve"
console.log('Hi, I am ' + this.name);
} else{
console.log('Sorry i can not speak');
}
};
原型可以像這樣例項化
obj = Object.create(Person.prototype);
ob.greet();
我們可以為建構函式傳遞值,並根據需求使布林值為 true 和 false。
詳細說明
var Human = function() {
this.canSpeak = true;
};
// Basic greet function which will greet based on the canSpeak flag
Human.prototype.greet = function() {
if (this.canSpeak) {
console.log('Hi, I am ' + this.name);
}
};
var Student = function(name, title) {
Human.call(this); // Instantiating the Human object and getting the memebers of the class
this.name = name; // inherting the name from the human class
this.title = title; // getting the title from the called function
};
Student.prototype = Object.create(Human.prototype);
Student.prototype.constructor = Student;
Student.prototype.greet = function() {
if (this.canSpeak) {
console.log('Hi, I am ' + this.name + ', the ' + this.title);
}
};
var Customer = function(name) {
Human.call(this); // inherting from the base class
this.name = name;
};
Customer.prototype = Object.create(Human.prototype); // creating the object
Customer.prototype.constructor = Customer;
var bill = new Student('Billy', 'Teacher');
var carter = new Customer('Carter');
var andy = new Student('Andy', 'Bill');
var virat = new Customer('Virat');
bill.greet();
// Hi, I am Bob, the Teacher
carter.greet();
// Hi, I am Carter
andy.greet();
// Hi, I am Andy, the Bill
virat.greet();