JavaScript reference tutorial

Example: Open a clean window 400 x 100: open ('', '_ blank', 'width = 400, height = 100, menubar = no, toolbar = no, location = no, directories = no, status = no, Scrollbars = yes, resizable = yes') Parameters TOP = # Window top Level of pixels at the top of the screen Left = # Window left left side left the left-left pixel number width = # window Width = # Window high menubar = ... window Is there a menu, value Yes or NOTOOLBAR = ... window has a toolbar, values ​​YES or NOLOCATION = ... Window has an address bar, value Yes or Nodirectories = ... window has a connection area, take Value Yes or Noscrollbars = ... window has no scroll bar, value YES or NOSTATUS = ... window There is no status bar, value Yes or NORSIZABLE = ... window does not adjust the size, value Yes or NO

The OPEN () method has a return value, returning is the window object it open. and so,

Var newWindow = Open ('', '_ blank');

This assigns a new window to the "NewWindow" variable, and then control the window through the "newWindow" variable.

Close () Close an open window. Usage: Window.close () or Self.close (): Close this window; .close (): Turn off the specified window. If the window has a status bar, the browser will warn: "The page is trying to close the window, is it close?" Then wait for the user to choose whether it is; if there is no status bar, call the method to close the window directly. Blur () makes the focus from the window, and the window becomes "non-active window". FOCUS () is a window to get focus and become a "active window". However, in Windows 98, this method can only flash the title bar of the window and the corresponding button on the taskbar, prompting the user that the window is trying to get the focus. ScrollTo () Usage: [.] ScrollTo (x, y); roll the window so that the document is rolled from the upper left angle (x, y) to the upper left corner of the window. Scrollby () usage: [.] scrollby (deltax, deltay); roll the window to the right to scroll down the Deltay pixels. If the negative value is taken, scroll in the opposite direction. ResizTo () Usage: [.] resizeto (width, height); adjust the window to the width width pixel, high HEIGHT pixels. Resizeby () Usage: [.] Resizeby (deltaWidth, DeltaHT); adjust the window to adjust the size, broaden the deltaWidth pixels, high increasing DeltaHeight pixels. If the negative value is taken, it is reduced. Alert () Usage: Alert (); pop up a dialog containing only the "OK" button, display the content of the , read the entire document, Script runs, until the user presses " determine". Confirm () usage: confirm (); pop up a dialog box containing the "OK" and "Cancel" button, display the contents of the , require the user to make a selection, read the entire document, Script It will be suspended. Returns the true value if the user presses "OK", if "cancel" is pressed, then returns the false value. Prompt () usage: prompt ( []); pop up a dialog box containing "confirmation" "cancel" and a text box, display content, requires the user in the text box Enter some data, read the entire document, Script run will be suspended. If the user presses "confirm", return to the content existing in the text box, return NULL values ​​if the user presses "cancel". If you specify , there will be a default value in the text box. event

OnLoad; OnResize; Onfocus; OneRror

History historical object history object refers to the browser browsing history. In view of the safety needs, the object receives a lot of restrictions, and now only the following properties and methods remain.

Attributes

Length history of history. History that JavaScript can manage is limited to the range of "advancement" "back" keys in the browser. This attribute returns the sum of the number of addresses included under "advancement" and "back" two buttons.

method

Back () back, follow the "Back" button is equivalent. Forward () advance, follow the "advance" button is equivalent. Go () usage: History.go (x); go to the specified address within the scope of history. If x <0, return X address, if x> 0, then forward X addresses, if x == 0, refresh the top now open. History.go (0) is equivalent to location.Reload (). Location Address Objects It describes the address opened by a window object. To indicate the address of the current window, just use "location" to do it; if you want to indicate the address of a window, use " .location".

Note that the two addresses belonging to different protocols or different hosts cannot be referenced to each other's Location objects, which is for security needs. For example, the current window opens "www.a.com", another window (object name: bwindow) opens "www.b.com" webpage. If you use "bwindow.location" in the current window, it will be wrong: "No Permissions". This error is to receive processing with the error handler (Event Handler, see the OneRror event).

Attributes

Protocol Returns the protocol of the address, with the value of 'http:', 'https:', 'file:', and so on. Hostname returns the host name of the address, for example, an address of "http://www.microsoft.com/china/", location.hostname == 'www.microsoft.com'. Port number of port returns the address, the general HTTP port number is '80'. Host returns host name and port number, such as: 'www.a.com: 8080'. Pathname Returns the path name, such as "http://www.a.com/b/c.html" ,location.pathname == 'b / c.html'. Hash returns "#" and later, such as "http://www.a.com/b/c.html#chapter4" ,location.hash == '# chapter4'; if there is no" # "in the address, Return to the empty string. Search returns "?" and later content, such as "http://www.a.com/b/c.asp?selection=3&jumpto=4" ,location.search == '? Selection = 3 & jumpto = 4'; if If there is no "?" In the address, it returns an empty string. HREF returns all the above content, that is, returns the entire address. How to display it on the address bar of the browser to return. If you want a window object to open an address, you can use "location.href = '...'", you can also use "location = '...'" to achieve this purpose.

method

Reload () is equivalent to "Refresh" or "Netscape" button on your browser. Replace () opens a URL and replaces the address of the current location in the historical object. After opening a URL with this method, press the "Back" button of the browser will not return to the page you just. Frames []; Frame Framework See "Use Framework and Cookies" chapter.

Document Document Object Describes the documentation of the current window or specifying a window object. It contains the content from to . Usage: Document (Current Window) or .document (Specified Window)

Attributes

Cookie For cookies, please refer to Chapter of "Use Framework and Cookies". LastModified Current Date of Documentation is a Date object. Referrer If the current document is opened by clicking on the connection, ReferR returns the original URL. Title refers to the text of