概述
ParentNode.firstElement 是一个只读属性，返回当前元素的第一个子元素节点，如果没有子元素节点，则返回null。
语法
var childNode = elementNodeReference.firstElementChild;
例子
<p id="para-01">
<span>First span</span>
</p>
<script type="text/javascript">
var p01 = document.getElementById('para-01');
alert(p01.firstElementChild.nodeName)
</script>
弹出框显示 "SPAN".
规范
| Specification | Status | Comment |
|---|---|---|
| DOM ParentNode.firstElementChild |
Living Standard | Splitted the ElementTraversalinterface in ChildNode and ParentNode. This method is now defined on the latter.The Document and DocumentFragment implemented the new interfaces. |
| Element Traversal Specification ElementTraversal.firstElementChild |
Recommendation | Added its initial definition to theElementTraversal pure interface and use it on Element. |
浏览器兼容性
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
Basic support (on Element) |
1.0 | 3.5 (1.9.1) | 9.0 | 10.0 | 4.0 |
Support on Document and DocumentFragment |
29.0 | 25.0 (25.0) | 未实现 | 16.0 | 未实现 |
| Feature | Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
Basic support (on Element) |
(Yes) | 1.0 (1.9.1) | (Yes) | (Yes) | (Yes) |
Support on Document and DocumentFragment |
(Yes) | 25.0 (25.0) | 未实现 | 16.0 | 未实现 |
相关链接
- The
ParentNodeandChildNodepure interfaces.