Detailed explanation of Windows objects course in JS-JS Tutorial-php.cn

Detailed explanation of Windows objects course in JS

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Release： 2018-05-17 11:10:07

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Detailed explanation of the Windows object course in JS

1. Description: It is the largest object in JS. It describes a browser window. Generally When you want to reference his properties and methods , you do not need to use the form "Window.XXX", but use "XXX" directly. A frame page is also a window.

2. The Window object has the following properties.

1.name The name of the window, consisting of the connection that opened it () or the frame page () or Determined by the open() method (see below) called by a certain window. Generally we will not use this attribute.

2.status refers to the content displayed in the "status bar" at the bottom of the window. By assigning a value to status, the display of the status bar can be changed.

3.opener Usage: window.opener; Returns the window object that opens this window. Note: What is returned is a window object. If the window is not opened by another window, this property returns null in Netscape and "undefined" in IE. undefined is equal to null to some extent. Note: undefined is not a JavaScript constant. If you try to use "undefined", it will really return "undefined".
4.self refers to the window itself, and the object it returns is exactly the same as the window object. The most commonly used is "self.close()", placed in the tag: "Close window".
5.parent returns the frame page object to which the window belongs.

6.top returns the frame page object occupying the top of the entire browser window.

3. The Window object has the following methods.

1.open(String>, , );

Description:

: Describes which web page the opened window opens. If left blank (''), no web page will be opened.
: Describes the name of the opened window (window.name). You can use built-in names such as '_top' and '_blank'. The name here is the same as the "target" attribute in "".
: Describes the appearance of the opened window. If you only need to open a normal window, leave the string blank (''). If you want to specify the appearance, write one or more parameters in the string, separated by commas.
Example: Open a 400 x 100 clean window: open('','_blank','width=400,height=100,menubar=no,toolbar=no,
location=no,directories= no,status=no, scrollbars=yes,resizable=yes')
Parameters of open()

top=# The number of pixels the top of the window leaves the top of the screen
left=# The left end of the window leaves the screen The number of pixels at the left end
width=# The width of the window
height=# The height of the window
menubar=... Whether the window has a menu, the value is yes or no
toolbar=... The window has There is no toolbar, the value is yes or no
location=... Whether the window has an address bar, the value is yes or no
directories=... Whether the window has a connection area, the value is yes or no
scrollbars=... Whether the window has scroll bars, the value is yes or no
status=... Whether the window has a status bar, the value is yes or no
resizable=... Whether the window will be resized, The value is yes or no
Note: The open() method has a return value, and what is returned is the window object it opens. For example,

var newWindow = open('','_blank');

Assign a new window to the "newWindow" variable, and then you can control the window through the "newWindow" variable. .
close() Close an open window.

blur() causes the focus to move away from the window and the window becomes an "inactive window".
focus() causes the window to gain focus and become the "active window". However, in Windows 98, this method can only make the window's title bar and the corresponding button on the taskbar flash, prompting the user that the window is trying to gain focus.
scrollTo() Usage: [.]scrollTo(x, y); Scroll the window so that the document scrolls from the (x, y) point counting from the upper left corner to the upper left corner of the window.
scrollBy() Usage: [.]scrollBy(deltaX, deltaY); Make the window scroll right by deltaX pixels and scroll down by deltaY pixels. A negative value scrolls in the opposite direction.
resizeTo() Usage: [.]resizeTo(width, height); causes the window to be resized to width pixels and height pixels.
resizeBy() Usage: [.]resizeBy(deltaWidth, deltaHeight); Make the window resize, increase the width by deltaWidth pixels, and increase the height by deltaHeight pixels. If it takes a negative value, it decreases.
alert() Usage: alert(); Pops up a dialog box containing only the "OK" button, displaying the content of . Reading of the entire document and running of the Script will Pause until user presses OK.
confirm() Usage: confirm(); pops up a dialog box containing "OK" and "Cancel" buttons, displays the content of , and requires the user to make a choice. Reading of documents and running of scripts will be suspended. Returns a true value if the user pressed OK and a false value if Cancel was pressed.
prompt() Usage: prompt([, ]); Pops up a dialog box containing "Confirm", "Cancel" and a text box, displaying is specified, the text box will have a default value.
4. The Window object has the following events:
window.onload; occurs when all documents are downloaded. All downloads have been completed, which means that not only the HTML files, but also all included images, plug-ins, controls, applets, etc. have been downloaded. This event is a window event, but when specifying the event handler program in HTML, we write it in the tag.
window.onunload; occurs when the user exits the document (or closes the window, or goes to another page). Like onload, if you want to write it in HTML, write it in the tag.

window.onresize;Occurs when the window is resized.
window.onblur;Occurs when the window loses focus.
window.onfocus;Occurs when the window gets focus.
window.onerror; occurs when an error occurs. Its event handler is usually called "Error HandlingProgram" (Error Handler), which is used to handle errors. As mentioned above, to ignore all errors, just use:

function ignoreError() {
  return true;
}
window.onerror = ignoreError;

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The above is a course on Windows objects in JS that I compiled for you. I hope it will be helpful to you in the future.

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