Is the javascript document object model a tree type?

The JavaScript document object model is a tree type. Document Object Model (DOM) is a standard programming interface for processing extensible markup languages recommended by the W3C organization. It is a tree-based API document.

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

In JavaScript, the document object model is a tree.

The Document Object Model (DOM) is a standard programming interface for processing extensible markup languages recommended by the W3C organization. DOM is a tree-based API document.

• Document: a real existing file such as: web page file (HTML text)

• Object: an independent data collection such as: document object document Data collection of elements and content

• Model: The document object is represented as a tree model. In this tree model, the elements and content of the web page are represented as nodes

Properties of the Window object:

• parent :

  The parent window object has the same meaning as the parent window containing a certain window self: this window, has the same meaning as referencing the current window top: refers to the top browser window in a series of nested windows frames: in the window object An array containing all frame objects document: Represents the current document object displayed in the window history: The history object of the window, including a list of recently visited URLs in the window location: Represents the URL address associated with the window object event: Window event object (Only for IE) name: window name opener: window object representing the open window defaultStatus: window status bar default value status: window status bar display information navigator: used to obtain browser information appName "Netscape" for Mozilla "Microsoft Internet Explorer" for IE

• Window object method

  alert(): Alert dialog box

  confirm(): Confirm dialog box

  prompt() : Information input dialog box

  close() : Close the window

  blur() : The window loses focus

  focus() : The window gains focus

  open (): Open a new window and create a new window object

  showModalDialog(): Open a modal dialog box

  showModelessDialog(): Open a non-modal dialog box

  The dialog box obtains the parameters passed in through window.dialogArguments

  The dialog box returns information to the window that opens the modal dialog box through window.returnValue. It can return the object to prevent the opening of a new window (such as submitting a form) ：

• Attributes of the document object

  title: Set the document title, which is equivalent to the HTML

  fgColor: Set the foreground color of the page, corresponding to the text attribute in the

  tag

  alinkColor: Set the color of the active link (the focus is on this link)

  linkColor: Set the color of the unclicked link

  vlinkColor: Set the color of the clicked link

  URL: URL of the document forms: Array of form objects, corresponding to the

  tag

  links: Array of link objects, corresponding to thetag with href attribute

  anchors: array of anchor objects, corresponding to thetag with name attribute

  images: array of image objects, corresponding to thetag

• Methods of document objects

  close(): used to close windows other than the current window

  write(): dynamically write content to the page

  getElementById() : Get the object with the specified ID value

  getElementsByName() : Get the object with the specified Name value, return the array

  getElementsByTagName("tr") : Get the object with the specified TagName, return the array

  createElement(): Create the specified HTML tag object var obj =createElement("input");

history object

Properties

• current: The URL of the document currently displayed in the window

Method

• back() : Load the previous page in the history table, equivalent to clicking the browser's return button

• forward(): Load the next page in the history table, equivalent to clicking the browser's return button Click the forward button on the browser

• go(string): Load the most recent document in the history table whose URL string contains this substring

• go(n): When n>0, load the nth document from the past in the history table; when n=0, load the current document; when n

location object

attribute

• hash

• host

• hostname

• href

Method

• assign(url): When assigning the URL directly to location, JavaScript calls this method

• reload(): Reload the window

• ## replace(): Replace the window

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