NonDocumentTypeChildNode.previousElementSibling

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句法
范例
Polyfills
规范
浏览器兼容性
另请参阅
相关话题

NonDocumentTypeChildNode.previousElementSibling read-only property returns the 元素 immediately prior to the specified one in its parent's children list, or null if the specified element is the first one in the list.

句法

prevNode = elementNodeReference.previousElementSibling;

范例

<div id="div-01">Here is div-01</div>
<div id="div-02">Here is div-02</div>
<li>This is a list item</li>
<li>This is another list item</li>
<div id="div-03">Here is div-03</div>
<script>
  let el = document.getElementById('div-03').previousElementSibling;
  document.write('<p>Siblings of div-03</p><ol>');
  while (el) {
    document.write('<li>' + el.nodeName + '</li>');
    el = el.previousElementSibling;
  }
  document.write('</ol>');
</script>

This example outputs the following into the page when it loads:

Siblings of div-03
   1. LI
   2. LI
   3. DIV
   4. DIV

Polyfills

Polyfill for Internet Explorer 8

This property is unsupported prior to IE9, so the following snippet can be used to add support to IE8:

// Source: https://github.com/Alhadis/Snippets/blob/master/js/polyfills/IE8-child-elements.js
if(!("previousElementSibling" in document.documentElement)){
  Object.defineProperty(Element.prototype, "previousElementSibling", {
    get: function(){
      var e = this.previousSibling;
      while(e && 1 !== e.nodeType)
        e = e.previousSibling;
      return e;
    }
  });
}

Polyfill for Internet Explorer 9+ and Safari

// Source: https://github.com/jserz/js_piece/blob/master/DOM/NonDocumentTypeChildNode/previousElementSibling/previousElementSibling.md
(function (arr) {
  arr.forEach(function (item) {
    if (item.hasOwnProperty('previousElementSibling')) {
      return;
    }
    Object.defineProperty(item, 'previousElementSibling', {
      configurable: true,
      enumerable: true,
      get: function () {
        let el = this;
        while (el = el.previousSibling) {
          if (el.nodeType === 1) {
            return el;
          }
        }
        return null;
      },
      set: undefined
    });
  });
})([Element.prototype, CharacterData.prototype]);

规范

规范	状态	注释
DOM The definition of 'NonDocumentTypeChildNode.previousElementSibling' in that specification.	实时标准	Splitted the `ElementTraversal` interface in `ChildNode` , `ParentNode` ，和 `NonDocumentTypeChildNode` . This method is now defined on the former. `元素` and `CharacterData` interfaces implemented the new interface.
Element Traversal Specification The definition of 'ElementTraversal.previousElementSibling' in that specification.	过时	Added its initial definition to the `ElementTraversal` pure interface and use it on `元素` .

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
`previousElementSibling`	Chrome 4	Edge 12 注意事项 12 注意事项 Before Edge 79, this property was only implemented for `元素` , not for `CharacterData` .	Firefox 3.5	IE 部分支持 9 注意事项部分支持 9 注意事项 Only implemented for `元素` , not for `CharacterData` 。见 polyfill .	Opera 10	Safari 4	WebView Android Yes	Chrome Android Yes	Firefox Android 4	Opera Android 10.1	Safari iOS Yes	Samsung Internet Android Yes

图例

完整支持
部分支持

另请参阅

NonDocumentTypeChildNode 纯接口。
Object types implementing this pure interface: CharacterData ，和 元素 .

元数据

最后修改： 2019 年 3 月 23 日

DOM (文档对象模型)
NonDocumentTypeChildNode
特性
1. nextElementSibling
2. previousElementSibling
实现通过：
1. CharacterData
2. 元素
DOM 相关页面

在此页

句法

范例

Polyfills

Polyfill for Internet Explorer 8

Polyfill for Internet Explorer 9+ and Safari

规范

浏览器兼容性

图例

另请参阅

相关话题