只读activeReturns the deepest element in the document through which or to which key events are being routed. This is, roughly speaking, the focused element in the document.
For the purposes of this API, when a child browsing context is focused, its container is focused in the parent browsing context. For example, if the user moves the focus to a text control in an iframe, the iframe is the element returned by the activeElement API in the iframe's node document.
Similarly, when the focused element is in a different node tree than documentOrShadowRoot, the element returned will be the host that's located in the same node tree as documentOrShadowRoot if documentOrShadowRoot is a shadow-including inclusive ancestor of the focused element, and null if not.
只读ATTRIBUTE_只读baseURIReturns node's node document's document base URL.
只读CDATA_node is a CDATASection node.
只读child只读childReturns the children.
只读childrenReturns the child elements.
只读COMMENT_node is a Comment node.
只读delegates只读DOCUMENT_node is a DocumentFragment node.
只读DOCUMENT_node is a document.
只读DOCUMENT_Set when other is a descendant of node.
只读DOCUMENT_Set when other is an ancestor of node.
只读DOCUMENT_Set when node and other are not in the same tree.
只读DOCUMENT_Set when other is following node.
只读DOCUMENT_只读DOCUMENT_Set when other is preceding node.
只读DOCUMENT_node is a doctype.
只读ELEMENT_node is an element.
只读ENTITY_只读ENTITY_只读firstReturns the first child.
只读firstReturns the first child that is an element, and null otherwise.
只读fullscreenReturns document's fullscreen element.
只读host只读isReturns true if node is connected and false otherwise.
只读lastReturns the last child.
只读lastReturns the last child that is an element, and null otherwise.
只读mode只读nextReturns the next sibling.
只读nodeReturns a string appropriate for the type of node.
只读nodeReturns the type of node.
只读NOTATION_只读ownerReturns the node document. Returns null for documents.
只读parentReturns the parent element.
只读parentReturns the parent.
只读picture只读pointer只读previousReturns the previous sibling.
只读PROCESSING_node is a ProcessingInstruction node.
只读slot只读styleRetrieves a collection of styleSheet objects representing the style sheets that correspond to each instance of a link or style object in the document.
只读TEXT_node is a Text node.
Throws a "NotSupportedError" DOMException if context object is a shadow root.
可选options: boolean | AddEventListenerOptionsAppends an event listener for events whose type attribute value is type. The callback argument sets the callback that will be invoked when the event is dispatched.
The options argument sets listener-specific options. For compatibility this can be a boolean, in which case the method behaves exactly as if the value was specified as options's capture.
When set to true, options's capture prevents callback from being invoked when the event's eventPhase attribute value is BUBBLING_PHASE. When false (or not present), callback will not be invoked when event's eventPhase attribute value is CAPTURING_PHASE. Either way, callback will be invoked if event's eventPhase attribute value is AT_TARGET.
When set to true, options's passive indicates that the callback will not cancel the event by invoking preventDefault(). This is used to enable performance optimizations described in § 2.8 Observing event listeners.
When set to true, options's once indicates that the callback will only be invoked once after which the event listener will be removed.
If an AbortSignal is passed for options's signal, then the event listener will be removed when signal is aborted.
The event listener is appended to target's event listener list and is not appended if it has the same type, callback, and capture.
可选options: boolean | AddEventListenerOptionsInserts nodes after the last child of node, while replacing strings in nodes with equivalent Text nodes.
Throws a "HierarchyRequestError" DOMException if the constraints of the node tree are violated.
动态参数...nodes: (string | Node)[]Returns a bitmask indicating the position of other relative to node.
Returns true if other is an inclusive descendant of node, and false otherwise.
Dispatches a synthetic event event to target and returns true if either event's cancelable attribute value is false or its preventDefault() method was not invoked, and false otherwise.
Returns the first element within node's descendants whose ID is elementId.
Returns node's root.
可选options: GetRootNodeOptionsReturns whether node and otherNode have the same properties.
Inserts nodes before the first child of node, while replacing strings in nodes with equivalent Text nodes.
Throws a "HierarchyRequestError" DOMException if the constraints of the node tree are violated.
动态参数...nodes: (string | Node)[]Returns the first element that is a descendant of node that matches selectors.
Returns all element descendants of node that match selectors.
Removes the event listener in target's event listener list with the same type, callback, and options.
可选options: boolean | EventListenerOptionsRemoves the event listener in target's event listener list with the same type, callback, and options.
可选options: boolean | EventListenerOptionsReplace all children of node with nodes, while replacing strings in nodes with equivalent Text nodes.
Throws a "HierarchyRequestError" DOMException if the constraints of the node tree are violated.
动态参数...nodes: (string | Node)[]
A minimal document object that has no parent. It is used as a lightweight version of Document that stores a segment of a document structure comprised of nodes just like a standard document. The key difference is that because the document fragment isn't part of the active document tree structure, changes made to the fragment don't affect the document, cause reflow, or incur any performance impact that can occur when changes are made.