


Detailed explanation of the attribute methods of element objects in DOM based on js
In HTML DOM (Document Object Model), each part is a node.
Nodes are the most basic components of the DOM structure. Each HTML tag is a node of the DOM structure.
The document is a document node.
All HTML elements are element nodes
All HTML attributes are attribute nodes
Text inserted into HTML elements are text nodes
Comments are comments node.
The most basic node type is the Node type. All other types are inherited from Node. DOM operations are often the most expensive part of js, so NodeList causes the most problems. Note: NodeList is 'dynamic', that is to say, every time a NodeList object is accessed, a query will be run. Although this increases the overhead, it can ensure that our newly added nodes can be accessed in the NodeList.
All element nodes have common attributes and methods, let’s take a look in detail:
Let’s first look at the more commonly used general attributes
1 element.id Sets or returns the element's id.
2 element.innerHTML Sets or returns the content of the element, which can include subtags and content in the node
3 element.innerText Sets or returns the content of the element, excluding subtags in the node And the content
4 element.className Set or return the class name of the element
5 element.nodeName Return the uppercase label name of the node
6 element.nodeType Return the node The node type of the point, 1 represents the element node 2 represents the attribute node...
7 element.nodeValue Returns the value of the node, the value of the element node is null
8 element.childNodes Return The nodeslist object of the element's child nodes. nodelist is similar to an array and has a length attribute. You can use square brackets [index] to access the value of the specified index (you can also use the item(index) method). But nodelist is not an array.
9 element.firstChild/element.lastChild Returns the first/last child node of the element (including comment nodes and text nodes)
10 element.parentNode Returns the parent node of the node
11 element.previousSibling Returns the previous node at the same level as the current node (including comment nodes and text nodes)
12 element.nextSibling Returns the next node at the same level as the current node (including Comment nodes and text nodes)
13 element.chileElementCount: Returns the number of child elements (excluding text nodes and comment nodes)
14 element.firstElementChild /lastElementChild returns the first/last A child element (excluding text nodes and comment nodes)
15 element.previousElementSibling/nextElementSibling Returns the previous/next sibling element (excluding text nodes and comment nodes)
16 element. clientHeight/clientWidth Returns the visual height/width of the content (not including borders, margins or scroll bars)
17 element.offsetHeight/offsetWidth /offsetLeft/offset/Top Returns the height/width of the element relative to the parent The left offset/right offset of the element (including borders and padding, excluding margins)
18 element.style Sets or returns the style attribute of the element. Example: element.style.backgroundColor Note that, unlike CSS, the style attribute must remove the horizontal bar and the first letter of the second word must be capitalized
19 element.tagName Returns the tag name of the element (capital)
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The browser displays the results:
There are also some exclusive attributes
Exclusive attributes refer to those attributes that are exclusive to a certain tag. For example, the tag has href and target attributes. has the src attribute;

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