Window:length 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.

返回窗口中框架的数量(包括 <frame><iframe> 元素)。

数字。

示例

js
if (window.length) {
  // 这是一个包含子框架的文档。
}

规范

Specification
HTML
# dom-length-dev

浏览器兼容性

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
length

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support