There are collections in JavaScript. The HTMLCollection object in JavaScript is an array-like list (collection) of HTML elements. The getElementsByTagName() method returns an HTMLCollection object.

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

There are collections in JavaScript. The HTMLCollection object in JavaScript is an array-like list (collection) of HTML elements. The getElementsByTagName() method returns an HTMLCollection object.

DOM collection in JavaScript:

The length attribute defines the number of elements in the HTMLCollection:

Example:

   
JavaScript HTML DOM
 
Hello World!
 
Hello China!
 
   

Effect:

Explanation of examples:

Create a collection of all

elements

Display the length of the collection

Note:

HTMLCollection is not an array!

HTMLCollection may look like an array, but it is not an array.

You can iterate over a list and reference elements numerically (just like an array).

However, you cannot use array methods such as valueOf(), pop(), push(), or join() on HTMLCollection.

[Recommended learning:javascript advanced tutorial]

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