Element.hasPointerCapture()

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hasPointerCapture() 方法在 元素 interface sets whether the element on which it is invoked has pointer capture for the pointer identified by the given pointer ID.

句法

targetElement.hasPointerCapture(pointerId);

参数

pointerId: pointerId 的 PointerEvent 对象。

返回值

A 布尔 value — true if the element does have pointer capture, false if it doesn't.

范例

<html>
  <script>
    function downHandler(ev) {
      const el = document.getElementById("target");
      // Element 'target' will receive/capture further events
      el.setPointerCapture(ev.pointerId);
      /* ... */
      // Check whether element still has pointer capture
      let pointerCap = el.hasPointerCapture(ev.pointerId);
      if(pointerCap) {
        // We've still got pointer capture
      } else {
        // oops, we've lost pointer capture!
      }
    }
    function init() {
      const el = document.getElementById("target");
      el.onpointerdown = downHandler;
    }
  </script>
  <body onload="init();">
    <div id="target">Touch this element with a pointer.</div>
  </body>
</html>

规范

规范	状态	注释
指针事件 – 2 级 The definition of 'hasPointerCapture()' in that specification.	推荐

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
`hasPointerCapture`	Chrome 55	Edge ≤79	Firefox 59 59 Disabled ). To change preferences in Firefox, visit	IE ?	Opera 42	Safari 13	WebView Android 55	Chrome Android 55	Firefox Android No 不支持 No Disabled ). To change preferences in Firefox, visit	Opera Android 42	Safari iOS 13	Samsung Internet Android 6.0

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句法

参数

返回值

范例

规范

浏览器兼容性

图例

另请参阅

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