Prototype

prototype属性允许您向任何对象添加属性和方法（Number，Boolean，String，Date等）。

Note - Prototype是一个全局属性，几乎可用于所有对象。

语法 (Syntax)

string.prototype

示例:对象原型

function employee(id, name) { 
   this.id = id; 
   this.name = name; 
} 
var emp = new employee(123, "Smith"); 
employee.prototype.email = "smith@abc.com"; 
console.log("Employee 's Id: " + emp.id); 
console.log("Employee's name: " + emp.name);
console.log("Employee's Email ID: " + emp.email);

输出 (Output)

Employee’s Id: 123 
Employee’s name: Smith 
Employee’s Email ID: smith@abc.com