Summary of commonly used design patterns (updated continuously…)

The singleton pattern

class Singleton { constructor(name) { this.name = name; this.instance = null; } static getInstance(name) { if (! this.instance) { this.instance = new Singleton(name); } return this.instance; } } const oA = Singleton.getInstance("hello"); const oB = Singleton.getInstance("world"); console.log(oA === oB);Copy the code

Observer model

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Publish and subscribe model

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