Document: scroll event

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范例
规范
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scroll event fires when the document view or an element has been scrolled.

冒泡	Yes
可取消	No
接口	`事件`
事件处理程序特性	`onscroll`

注意： In iOS UIWebViews, scroll events are not fired while scrolling is taking place; they are only fired after the scrolling has completed. See Bootstrap issue #16202 . Safari and WKWebViews are not affected by this bug.

范例

Scroll event throttling

由于 scroll events can fire at a high rate, the event handler shouldn't execute computationally expensive operations such as DOM modifications. Instead, it is recommended to throttle the event using requestAnimationFrame() , setTimeout() ，或 CustomEvent , as follows.

Note, however, that input events and animation frames are fired at about the same rate, and therefore the optimization below is often unnecessary. This example optimizes the scroll event for requestAnimationFrame .

// Reference: http://www.html5rocks.com/en/tutorials/speed/animations/
let last_known_scroll_position = 0;
let ticking = false;
function doSomething(scroll_pos) {
  // Do something with the scroll position
}
window.addEventListener('scroll', function(e) {
  last_known_scroll_position = window.scrollY;
  if (!ticking) {
    window.requestAnimationFrame(function() {
      doSomething(last_known_scroll_position);
      ticking = false;
    });
    ticking = true;
  }
});

See more, similar examples on the resize event page.

规范

规范	状态
CSSOM (CSS 对象模型) 视图模块	工作草案

浏览器兼容性

更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`scroll` event	Chrome 1	Edge 12	Firefox 6	IE 9	Opera 11.6	Safari 2	WebView Android 1	Chrome Android 18	Firefox Android 6	Opera Android 12	Safari iOS 1	Samsung Internet Android 1.0

图例

完整支持

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Element: scroll event

元数据

最后修改： Jul 13, 2020

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范例

Scroll event throttling

规范

浏览器兼容性

图例

另请参阅

相关话题