Javascript: the browser Object Model (BOM)

Window

• The window object is a browser or framework itself. Top is always a browser, parent is a parent framework, and Self represents itself.
  Windows can be omitted.
• Window operation: moveBy (dx, Dy), moveTo (x, y ),
  ResizeBy (DW, DH), resizeTo (W, H ).
• Navigation: window. Open (URL, Frame
  Name, attribute). attribute can be left, top, height, width, resizable,
  Scrollable, toolbar, status, location (all default no ).
  • Window. Open
    A new window reference is returned, and an opener object indicates the parent window.
  • Window. Close.
• Dialog Box:
  Alert, confirm, prompt.
• Status Bar: window. Status, window. defaultstatus
• Hour
  Interval and pause: timeoutid = setTimeout ("alert ('Hello World')", 1000 );
  Cleartimeout (timeoutid); similar to setinterval and clearinterval.
• History:
  Window. History. Go (+-N), history. Back, history. Forward. History. Length

Document

• Alert(registry.doc ument
  = Document) = true. It is the only object that belongs to both Dom and BOM.
• Attribute: title, URL,
  Referrer, lastmodified
• Set attributes: anchors, applets, embeds, forms,
  Images, links.
• Method: Write, writeln.
  The write () and writeln () methods must be called before the page is fully loaded. If any method is called after the page is loaded, it will erase the page content and display the specified content.

Location

• Window and
  Document attributes are equivalent to each other.
• Attribute: Hash (something behind #), host, hostname, href,
  Pathname, port, protocol, search (located in? ).
• Method: Assign (),
  Replace (), reload (false = import from cache (default), true = import from server)

Navigator and
Screen Object

• The navigator object represents the browser itself and can obtain some attributes, but each browser supports different attributes.
• Screen
  You can obtain the user system information, such as availheight, availwidth (available screen width and height, excluding the system taskbar), colordepth,
  Height, width.