A brief discussion on the method of converting array-like objects into array objects in jquery

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Definition of array-like objects:

The so-called "array-like object" is a regular Object object, such as $("p"), but it is very similar to an array object: it has a length attribute, and uses numbers such as 0, 1, 2, 3... as attribute names.

But it is not an array after all, and there are no built-in methods inherited from the prototype object of the array (for example: push(), sort(), etc.)

jquer general class array Method of converting an object into an array object

In jquery, you can use the markArray method to convert an array-like object into an array object, such as:

var result = $.makeArray($("p"));
console.log(result instanceof Array);

The result printed by the code at this time is true. In es6, you can use Array.from(...) to achieve array conversion:

Array.from(document.getElementsByTagName("p")

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