9. BOM object?

BOM yes browser object model Abbreviation , Browser object model for short .

adopt BOM We can learn some objects that interact with browser windows , Can be moved , Resizing the browser window object , It can be used
For navigation location Object and the history object , You can get the browser , Operating system and user screen information navigator And
screen object , have access to document As an interview HTML The entry to the document , Of the management framework frames Object etc. . So its core is It's like window.

1.Window Object properties

Window object ： window Object represents an open window in the browser
Window Object properties ：
Document object .
history object .
Location object
Screen object
name The name of the browser window
defaultStatus Sets or returns the default text in the window status bar .
status Set the text of the window status bar

2.location object

Location Object contains information about the current URL Information about .（ Understanding can ）
location Object properties
href attribute Control the contents of the browser address bar
hostname Set or return to current URL The host name .
location Object method
reload() Method Refresh the page
reload(true) Refresh the page , Do not use cache

3.history object

history Object contains user ( In the browser window ) Visited URL.（ Understanding can ）
attribute ：
length Return to URL Number .
Method ：
back() load history The previous one in the list URL.
forward() load history Next... In the list URL.
go() load history A specific page in the list , Or ask the browser to move to a specified number of pages （ Negative numbers are backward , just
Count forward ）

4.navigator object

navigator Object contains information about the browser .（ Understanding can ）
appName Browser name
appVersion Browser version
platform operating system
notes ： The latest browsers have completely abandoned these properties
userAgent User agent information , Through this attribute, you can obtain browser and operating system information
The demo part window Object properties

5.document object

Every browser loaded with HTML Documents will become Document object .
Document Object enables us to modify from script HTML All elements in the page are accessed
Document The object is Window Part of the object , It can be done by window.document Property to access it
Document Object properties
all[] Provides a description of all HTML Element access . It's an array type
forms[] Return to all of the Form Object reference . It's an array type
body Provide right Direct access to elements .
URL Returns the URL.
bgColor attribute ： You can change the color of the document ;（ document.bgColor=“gray”;）
Document Object function ( Method )
getElementById() Return to have specified id Reference to the first object of .
getElementsByName() Returns a collection of objects with the specified name .
getElementsByTagName() Returns a collection of objects with the specified tag name .
write() Write... To the document HTML expression or JavaScript Code .

6.Window Object method

alert(“”) Display a warning box with a message and a confirm button .
confirm(“”) Displays a dialog box with a message and a confirm and Cancel buttons .
prompt(“”) Displays a dialog box that prompts for user input .
open(“url”,”name”) Open a new browser window or find a named window .
showModalDialog (“ Open the window url”,” Window name ”,” Window features ”)(chrome I won't support it )
close() Close the browser window . （ FF I won't support it ）
focus () The window loses focus
setInterval() According to the specified period （ In milliseconds ） To call a function or evaluate an expression .
clearInterval() Cancel from setInterval() Set up timeout.
setTimeout() Call the function or computing expression after the specified millisecond count. .
clearTimeout() Cancel from setTimeout() Method set timeout.
moveBy() Moves the window to the specified pixel relative to its current coordinates .
moveTo() Move the upper left corner of the window to a specified coordinate .
resizeBy() Resize the window to the specified pixel .
resizeTo() Resize the window to the specified width and height .
scrollBy() Scrolls content according to the specified pixel value .
scrollTo() Scroll content to specified coordinates .