An in-depth analysis of JavaScript design patterns: polymorphism

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The meaning of polymorphism

The same operation can produce different interpretations when applied to different objects. and different execution structures. That is, when the same message is sent to different objects, these objects will give different feedback based on the message.

The idea behind polymorphism

will "do "What" is separated from "who does it and how", that is, "unchangeable things" are separated from "changeable things".

Polymorphism of objects

<span style="font-family: 微软雅黑, "Microsoft YaHei";">// 要做的事情：输出用户的年龄<br/>var printAge = function(person) {<br/>  if (person.age instanceof Function) {<br/>    person.age();<br/>  }<br/>};<br/><br/>// 都有哪些用户以及这些用户要怎么做一些事情<br/>var Jack = function() {};<br/>Jack.prototype.age = function() {<br/>  console.log(&#39;age: 26&#39;);<br/>};<br/><br/>var Olive = function() {};<br/>Olive.prototype.age = function() {<br/>  console.log(&#39;age: 20&#39;);<br/>};<br/><br/>printAge( new Jack() );  // age: 26<br/>printAge( new Olive() );  // age: 20<br/></span>

Advantages of object-oriented design
Distribute behavior among various objects and let each of these objects be responsible for their own behavior. This is the advantage of object-oriented design.

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