Event.defaultPrevented

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句法
范例
规范
浏览器兼容性
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defaultPrevented 只读特性在 事件 interface returns a 布尔 indicating whether or not the call to Event.preventDefault() canceled the event.

注意： You should use this instead of the non-standard, deprecated


							getPreventDefault()

method (see bug 691151 ).

句法

var defaultWasPrevented = event.defaultPrevented;

值

A 布尔 ，其中 true indicates that the default 用户代理 action was prevented, and false indicates that it was not.

范例

This example logs attempts to visit links from two <a> elements. JavaScript is used to prevent the second link from working.

HTML

<p><a id="link1" href="#link1">Visit link 1</a></p>
<p><a id="link2" href="#link2">Try to visit link 2</a> (you can't)</p>
<p id="log"></p>

JavaScript

function stopLink(event) {
  event.preventDefault();
}
function logClick(event) {
  const log = document.getElementById('log');
  if (event.target.tagName === 'A') {
    if (event.defaultPrevented) {
      log.innerText = 'Sorry, but you cannot visit this link!\n' + log.innerText;
    }
    else {
      log.innerText = 'Visiting link...\n' + log.innerText;
    }
  }
}
const a = document.getElementById('link2');
a.addEventListener('click', stopLink);
document.addEventListener('click', logClick);

结果

规范

规范	状态	注释
DOM The definition of 'Event.defaultPrevented()' 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
`defaultPrevented`	Chrome 18	Edge 12	Firefox 6	IE 9	Opera 11	Safari 5	WebView Android Yes	Chrome Android 18	Firefox Android 6	Opera Android 11	Safari iOS 5	Samsung Internet Android 1.0

图例

完整支持

元数据

最后修改： Feb 23, 2020

DOM (文档对象模型)
事件
构造函数
1. 事件
特性
1. bubbles
2. cancelable
3. cancelBubble
4. composed
5. currentTarget
6. defaultPrevented
7. eventPhase
8. explicitOriginalTarget
9. isTrusted
10. originalTarget
11. returnValue
12. srcElement
13. target
14. timeStamp
15. type
方法
事件
1. bubbles
2. cancelable
3. cancelBubble
4. composed
5. composedPath
6. currentTarget
7. defaultPrevented
8. 事件
9. eventPhase
10. initEvent
11. isTrusted
12. preventDefault
13. returnValue
14. stopImmediatePropagation
15. stopPropagation
16. target
17. timeStamp
18. type
DOM 相关页面

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句法

值

范例

HTML

JavaScript

结果

规范

浏览器兼容性

图例

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