Write js extension method to determine whether an array contains an element_javascript skills

In C# syntax, you can use the Contains method to determine whether a collection contains an element, but how to deal with similar problems in JavaScript? There is no Contains method in js.
We can use the prototype extension of js to encapsulate our own Contains method.

js code:

Copy code The code is as follows:

Verification found that array objects using the contains method do not need to be explicitly declared, that is, the italicized part in the above code can be abbreviated as:

Copy code The code is as follows:

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