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 2015年7月.
值
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
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