JavaScript Learning Note 3 Introduction to JavaScript and BOM

What is a BOM

• The BOM is an abbreviation for the browser object model .
• BOM provides an object that is independent of the content and interacts with the browser window
• Because the BOM is primarily used to manage the communication between Windows and Windows, its core object is window
• A BOM is composed of a series of related objects , and each object provides many methods and properties
• BOM lack of standard, JavaScript Grammar Standardization Organization is ECMA,DOM standardization Organization is the
• The BOM was originally part of the Netscape browser standard
  

BOM Chart BOM object including Window object

is the top-level (core) object of the BOM, all of which are extended through it, and can also be referred to as child objects of window. Because window is the top-level object, you can call its child objects without displaying the indicated window object, for example, the following two lines of code are the same:

document.write ("www.dreamdu.com");  
Window.document.write ("www.dreamdu.com");

Properties and methods of the Window object:
All JavaScript global objects, functions, and variables automatically become members of the Window object.
A global variable is a property of a Window object.
A global function is a method of a Window object.

JavaScript Learning Note 3 Introduction to JavaScript and BOM