The usage of document.all in JS

1. What is document.all?

The document.all essence is the collection of all the elements in the document. Can be seen as an array.

How to use 2.document.all?2.1 Take the element according to subscript. syntax: Document.all[index]; Index: The subscript to be taken.

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 Operation Result:2.2 Take elements according to NAME/ID. Syntax: document.all ("name/id", index) The second argument is index, optional. Index indicates that if there are multiple identical name/id, take the first of the Name/id collection. Of course the ID should not be duplicated.
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 How to use document.all in JS