JS Instance--dom operation

DOM Level 0: document direct access; can be by array form, ID or name (discouraged)

• Image
• Forms
• Links
• Cookies;

Common ways to get nodes:

• getElementById;
• Getelementbyname;
• Getelementbyclassname; The element object is also available
• Getelementbytagname; The element object is also available
• Queryselector; Available CSS style selector string access
• Queryselectorall; Available CSS style selector string access

Node Properties:

• NodeName;

Node Relationship:

• ParentNode; Direct parent Node
• ChildNodes;//Direct child node, plural, note that the text node should be included;
• Children; Direct child nodes, plural, not including text nodes

Node Judgment:

• HasChildNodes ();

NodeList: Gets the collection of multiple nodes coming in

• Length: unique attribute;
• Item: the only method;

Node Operation:

• createelement;
• AppendChild;

JS Instance--dom operation