TimeRanges.length

只读属性 TimeRanges.length 返回对象中时间范围的个数。

语法

length = TimeRanges.length;

示例

假定页面中存在一个 ID 为“myVideo”的 video 元素:

js
var v = document.GetElementById("myVideo");

var buf = v.buffered;

var numRanges = buf.length;

if (buf.length == 1) {
  // Only one range
  if (buf.start(0) == 0 && buf.end(0) == v.duration) {
    // The one range starts at the beginning and ends at
    // the end of the video, so the whole thing is loaded
  }
}

这个例子演示了如何通过 TimeRanges 来判断 video 是否已经完全加载。

规范

Specification
HTML
# dom-timeranges-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

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Full support
Full support