js implements cloning and value copying of 5 data types

The content of this article is about cloning and copying the values ​​of 5 main data types in JavaScript. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Data type: (including Number, String, Object, Array, Boolean)
The key point is: Object is divided into objects or arrays
Determine whether it is an array:

function isArray(obj) {  
  return Object.prototype.toString.call(obj) === '[object Array]';   
}

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