GlobalEventHandlers.onwheel

在此页

句法
范例
规范
浏览器兼容性
另请参阅
相关话题

onwheel 特性为 GlobalEventHandlers 混合 EventHandler 处理 wheel 事件。

wheel event fires when the user rotates the mouse (or other pointing device) wheel.

注意： Don't confuse onwheel with onscroll : onwheel handles general wheel rotation, while onscroll handles scrolling of an object's content.

句法

target.onwheel = functionRef;

值

functionRef is a function name or a 函数表达式 . The function receives a WheelEvent object as its sole argument.

范例

This example shows how to scale an element using the mouse (or other pointing device) wheel.

HTML

<div>Scale me with your mouse wheel.</div>

CSS

body {
  min-height: 100vh;
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
div {
  width: 80px;
  height: 80px;
  background: #cdf;
  padding: 5px;
  transition: transform .3s;
}

JavaScript

function zoom(event) {
  event.preventDefault();
  if (event.deltaY < 0) {
    // Zoom in
    scale *= event.deltaY * -2;
  }
  else {
    // Zoom out
    scale /= event.deltaY * 2;
  }
  // Restrict scale
  scale = Math.min(Math.max(.125, scale), 4);
  // Apply scale transform
  el.style.transform = `scale(${scale})`;
}
let scale = 1;
const el = document.querySelector('div');
document.onwheel = zoom;

结果

规范

规范	状态	注释
HTML 实时标准 The definition of 'onwheel' in that specification.	实时标准

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 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
`onwheel`	Chrome 61	Edge 12	Firefox Yes	IE Yes	Opera 48	Safari Yes	WebView Android 61	Chrome Android 61	Firefox Android Yes	Opera Android 45	Safari iOS Yes	Samsung Internet Android 8.0

在此页

句法

值

范例

HTML

CSS

JavaScript

结果

规范

浏览器兼容性

图例

另请参阅

元数据

相关话题