Window.screenTop

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Window.screenTop 只读属性返回垂直距离,单位是CSS 像素, 从用户浏览器的上边界到屏幕最顶端。

Note: screenTop is an alias of the older Window.screenY property. screenTop was originally supported only in IE but was introduced everywhere due to popularity.

语法

topWindowPos = window.screenTop 

返回值

A number equal to the number of CSS pixels from the top edge of the browser viewport to the  top edge of the screen.

例子

In our screenleft-screentop example, you'll see a canvas onto which has been drawn a circle. In this example we are using screenLeft/screenTop plus Window.requestAnimationFrame() to constantly redraw the circle in the same physical position on the screen, even if the window position is moved.

initialLeft = window.screenLeft + canvasElem.offsetLeft;
initialTop = window.screenTop + canvasElem.offsetTop;

function positionElem() {
  let newLeft = window.screenLeft + canvasElem.offsetLeft;
  let newTop = window.screenTop + canvasElem.offsetTop;

  let leftUpdate = initialLeft - newLeft;
  let topUpdate = initialTop - newTop;

  ctx.fillStyle = 'rgb(0, 0, 0)';
  ctx.fillRect(0, 0, width, height);
  ctx.fillStyle = 'rgb(0, 0, 255)';
  ctx.beginPath();
  ctx.arc(leftUpdate + (width/2), topUpdate + (height/2) + 35, 50, degToRad(0), degToRad(360), false);
  ctx.fill();

  pElem.textContent = 'Window.screenLeft: ' + window.screenLeft + ', Window.screenTop: ' + window.screenTop;

  window.requestAnimationFrame(positionElem);
}

window.requestAnimationFrame(positionElem);

Also in the code we include a snippet that detects whether screenLeft is supported, and if not, polyfills in screenLeft/screenTop using Window.screenX/Window.screenY.

if(!window.screenLeft) {
  window.screenLeft = window.screenX;
  window.screenTop = window.screenY;
}

说明

Specification Status Comment
CSS Object Model (CSSOM) View Module
Window.screenTop
Working Draft Initial definition.

浏览器兼容性

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
screenTopChrome Full support 1Edge Full support 12Firefox Full support 64IE Full support 5Opera Full support ≤12.1Safari Full support 1WebView Android Full support 1Chrome Android Full support 18Firefox Android Full support 64Opera Android Full support ≤12.1Safari iOS Full support 1Samsung Internet Android Full support 1.0

Legend

Full support  
Full support

参考