Document:firstElementChild 属性
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
Document.firstElementChild
只读属性返回文档的第一个子元素,如果没有子元素,则返回 null
。
对于 HTML 文档,这通常是唯一的子元素,即 <html>
根元素。
有关文档中特定元素的第一个子元素,请参见 Element.firstElementChild
。
值
Element
对象或 null
。
示例
js
document.firstElementChild;
// 返回 <html> 根元素,即文档的唯一子元素
规范
Specification |
---|
DOM # ref-for-dom-parentnode-firstelementchild① |
浏览器兼容性
Report problems with this compatibility data on GitHubdesktop | mobile | |||||||||||
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firstElementChild |
Legend
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- Full support
- Full support
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