HTMLIFrameElement.getVolume() - Mozilla

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句法
范例
规范
浏览器兼容性
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非标
此特征是非标准的，且不在标准轨道中。不要在面向 Web 的生产站点中使用它：它不适用于每个用户。实现之间可能存在大的不兼容性，且行为将来可能改变。

getVolume() 方法在 HTMLIFrameElement gets the current volume of the browser <iframe> .

句法

There are two versions of this method, a callback version:

var request = instanceOfHTMLIframeElement.getVolume();

和 Promise version:

instanceOfHTMLIframeElement.getVolume().then(function(volume) { ... });

Callback version: A DOMRequest that represents the get volume request. It has an onsuccess handler to handle the success case, and an onerror handler to handle the failure case. The volume value is available in the request.result property, and is a floating point number between 0 and 1.
Promise version: A Promise that resolves with the volume value — a floating point number between 0 and 1.

参数

None.

范例

Callback version:

var browser = document.querySelector('iframe');
var request = browser.getVolume();
request.onsuccess = function() {
  console.log('The current browser volume is ' + request.result);
}

Promise version:

var browser = document.querySelector('iframe');
browser.getVolume().then(function(volume) {
  console.log('The current browser volume is ' + volume);
});

规范

Not part of any specification.

浏览器兼容性

Supported since Firefox 47, in chrome code only.

Unlikely ever to be supported in other browsers.

另请参阅

Using the Browser API

元数据

最后修改： Apr 30, 2019

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句法

返回

参数

范例

规范

浏览器兼容性

另请参阅

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