Window: thuộc tính 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.
Returns the number of frames (either <frame> or
<iframe> elements) in the window.
Giá trị
A number.
Ví dụ
js
if (window.length) {
// this is a document with subframes
}
Đặc tả kỹ thuật
| Specification |
|---|
| HTML # dom-length-dev |