What attributes does dom have?

There are many dom attributes, among which parentNode represents the acquisition of the current parent node, childNodes represents the collection of child nodes, firstChild represents the first child node, lastChild represents the last child node, previousSibling represents the previous sibling node, etc. Commonly used Attributes.

The operating environment of this article: Windows 7 system, Dell G3 computer, javascript version 1.8.5.

In the last article we learned what dom is? Let’s explain what attributes dom has?

1. Introduction to dom

dom can control all element objects in the page. Each element is an object. The DOM standard can be divided into three different parts: core DOM, xmldom and htmldom.

2. What is the role of dom

When many people build websites, they need to implement user interaction. Static pages cannot satisfy this and need to use dynamic implementation. , but there is a lot of content to be queried, and the data needs to be synchronized in real time, we can use dom, which is an index directory used to retrieve elements or content.

3. What attributes does dom have?

In dom, we regard each element as a node, and Each node is an object. We only need to treat the node as an object and then use the object properties to operate.

There are many dom attributes, among which parentNode represents the acquisition of the current parent node, childNodes represents the collection of child nodes, firstChild represents the first child node, lastChild represents the last child node, previousSibling represents the previous sibling node, etc. Commonly used Attributes.

4. Advantages and disadvantages of dom

When we use dom, we put all documents in memory, and dom can support XPath. Increased ease of use. But the only disadvantage is that the parsing speed is slow, takes up a lot of memory, and the efficiency becomes low.

The above is a complete introduction to the attributes of dom. If you want to know more about JavaScript video tutorial, please pay attention to the php Chinese website.

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