What is a DOM object? Introduction to DOM objects-CSS Tutorial-php.cn

What is a DOM object? Introduction to DOM objects

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Release： 2018-11-05 14:04:58

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What this article brings to you is about DOM objects? An introduction to DOM objects has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

What is a DOM object? Introduction to DOM objects

1. DOM object

DOM, the full name is "Document Object Model (Document Object Model)", which is organized by W3C defined as a standard.

In front-end development, we often need to add an element or delete an element somewhere on the page. This operation of adding elements and deleting elements is implemented through the DOM.

To put it bluntly, DOM is an interface. We can use DOM to operate various elements in the page, such as adding elements, deleting elements, replacing elements, etc. Now everyone will understand. Remember, DOM is the Document Object Model, and the Document Object Model is the DOM. Many people don’t know what the “Document Object Model” is when they see it when they are learning DOM?

2. DOM structure

DOM uses a tree structure as a hierarchical structure, and represents various elements or content in the page in the form of tree nodes.

Example:

<html>
<head>
    <title><title>
<body>
    <h1>php中文网</h1>
    <p>php中文网成立.....</p>
</body>
</html>

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In the DOM, each element is regarded as a node, and each node is an "object". That is to say, when we operate elements, we treat each element node as an object, and then use the properties and methods of this object to perform related operations. (This sentence is too important for understanding DOM operations).

Below we introduce several concepts about nodes.

1. Root node

In HTML documents, html is the root node.

2. Parent node

The node above a node is the parent node of the node. For example, the parent node of h1 is body, and the parent node of body is html.

3. Child nodes

The nodes under a node are the child nodes of the node. For example, h1 is the child node of body.

4. Sibling nodes

If multiple nodes are at the same level and have the same parent node, then these nodes are sibling nodes.

For example, h1 and p are sibling nodes because they have the same parent node body.

The above is the introduction to what is a DOM object? A complete introduction to the introduction of DOM objects. If you want to know more about CSS3 tutorial, please pay attention to the PHP Chinese website.

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