TimeRanges.start()

返回指定时间范围的开始偏移量。

语法

startTime = TimeRanges.start(index) 

参数

  • index 想要检索的时间范围的索引值。

异常

INDEX_SIZE_ERR
如果不存在指定索引值的时间范围,抛出 DOMException 异常。

示例

假定页面中存在一个ID为“myVideo”的 video 元素:

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 Status Comment
HTML Living Standard
TimeRanges.start()
Living Standard Initial definition

浏览器兼容性

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
startChrome Full support YesEdge Full support 12Firefox Full support YesIE Full support YesOpera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesFirefox Android Full support YesOpera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yes

Legend

Full support  
Full support