In JavaScript, you can determine the type of HTML tags by accessing the DOM tree. DOM tree refers to the document object model, which is a tree structure generated by the browser and represents the hierarchical structure of HTML documents. Click to learn the excellent course of famous teachers from big factories.

Through DOM tree, we can get the types of HTML tags as follows:

1. Using document objects to get HTML tags

You can get the elements in an HTML document through the document object.

2. Use the nodeType property of DOM node to get the HTML tag type. NodeType attribute of DOM node indicates the type of node, and different types correspond to different numbers. The HTML tag is represented as 1 in the DOM tree, so the type of the HTML tag can be judged.

3. use the instanceof keyword to determine whether it is an HTMLElement object. HTMLElement is an interface representing HTML elements in JavaScript, and instanceof can be used to determine whether an element is an HTMLElement object.

It should be noted that the above method obtains the original HTML tag types, such as div, span and so on. , excluding specific attributes such as class and id. If you need to get the class and id attributes of an element, you need to use other methods.

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