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This article mainly introduces the relevant knowledge of how to write the prototype of javascript instanceof, the content is detailed and easy to understand, the operation is simple and fast, and it has a certain reference value. I believe you will gain something after reading this prototype of javascript instanceof. Let's take a look at it.

Description

1. Instanceof is used to determine whether the reference type belongs to a structure function, and it can also determine whether the instance belongs to the parent type in the inheritance relationship.

2. The principle of instanceof is to determine whether the _ _ proto__ of the instance object points to the same reference as the prototype of the structure function.

Example

Obj3.__proto__ = M.prototypeM.prototype.protoprototypes _ = Object.prototypetrue / / accurately determine which constructor is, you can use constructorobj3.__proto__.constructor = = Mtrueobj3.__proto__.constructor = Objectfalse on "how to write the prototype of javascript instanceof" this article is introduced here, thank you for reading! I believe you all have a certain understanding of the knowledge of "how to write the prototype of javascript instanceof". If you want to learn more, you are welcome to follow the industry information channel.

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