NamedNodeMap.length
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.
length
は NamedNodeMap
インターフェイスの読み取り専用プロパティで、このマップに格納されているオブジェクトの数を示します。
値
このマップにあるオブジェクトの数を示す数値です。
例
html
<pre zero="test" one="test" two="test"></pre>
js
const pre = document.getElementsByTagName("pre")[0];
const attrMap = pre.attributes;
let result = `The 'test' attribute contains ${attrMap.length} attributes.\n`;
pre.textContent = result;
仕様書
Specification |
---|
DOM # dom-namednodemap-length |
ブラウザーの互換性
Report problems with this compatibility data on GitHubdesktop | mobile | |||||||||||
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length |
Legend
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- Full support
- Full support
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.