Screen
介面表示了一個用戶端螢幕,通常是指呈現目前頁面的視窗。
一般來說為顯示目前網頁的視窗,可以透過 window.screen
取得物件實體。
屬性
Screen.availTop
- Specifies the y-coordinate of the first pixel that is not allocated to permanent or semipermanent user interface features.
Screen.availLeft
- Returns the first available pixel available from the left side of the screen.
Screen.availHeight
- Specifies the height of the screen, in pixels, minus permanent or semipermanent user interface features displayed by the operating system, such as the Taskbar on Windows.
Screen.availWidth
- Returns the amount of horizontal space in pixels available to the window.
Screen.colorDepth
- Returns the color depth of the screen.
Screen.height
- Returns the height of the screen in pixels.
Screen.left
- Returns the distance in pixels from the left side of the main screen to the left side of the current screen.
Screen.orientation
- Returns the current orientation of the screen.
Screen.pixelDepth
- Gets the bit depth of the screen.
Screen.top
- Returns the distance in pixels from the top side of the current screen.
Screen.width
- Returns the width of the screen.
Screen.mozEnabled
- Boolean. Setting to false will turn off the device's screen.
Screen.mozBrightness
- Controls the brightness of a device's screen. A double between 0 and 1.0 is expected.
事件處理器
Screen.onorientationchange
- A handler for the
orientationchange
events.
方法
Screen.lockOrientation
- Lock the screen orientation (only works in fullscreen or for installed apps)
Screen.unlockOrientation
- Unlock the screen orientation (only works in fullscreen or for installed apps)
Methods inherit from EventTarget
EventTarget.addEventListener()
- Registers an event handler of a specific event type on the
EventTarget
. EventTarget.removeEventListener()
- Removes an event listener from the
EventTarget
. EventTarget.dispatchEvent()
- Dispatches an event to this
EventTarget
.
Additional methods for Mozilla chrome code
Mozilla includes a couple of extensions for use by JS-implemented event targets to implement onevent
properties. See also WebIDL bindings.
void setEventHandler(DOMString type, EventHandler handler)
EventHandler getEventHandler(DOMString type)
範例
if (screen.pixelDepth < 8) {
// use low-color version of page
} else {
// use regular, colorful page
}
規範
Specification | Status | Comment |
---|---|---|
CSS Object Model (CSSOM) View Module The definition of 'Screen' in that specification. |
Working Draft |