OscillatorNode.start()

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句法
范例
规范
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start 方法在 OscillatorNode interface specifies the exact time to start playing the tone. Its parameter is optional and default to 0 .

句法

oscillator.start(when); // start playing oscillator at the point in time specified by when

参数

当可选: An optional double representing the time (in seconds) when the oscillator should start, in the same coordinate system as AudioContext 's currentTime attribute. If a value is not included or is less than currentTime , the oscillator starts playing immediately.

范例

The following example shows basic usage of an AudioContext to create an oscillator node. For an applied example, check out our Violent Theremin demo ( see app.js for relevant code).

// create web audio api context
var audioCtx = new (window.AudioContext || window.webkitAudioContext)();
// create Oscillator node
var oscillator = audioCtx.createOscillator();
oscillator.type = 'square';
oscillator.frequency.setValueAtTime(3000, audioCtx.currentTime); // value in hertz
oscillator.start();

规范

规范	状态	注释
Web 音频 API The definition of 'start' in that specification.	工作草案

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`start`	Chrome 14	Edge 12	Firefox 25 注意事项 25 注意事项 Before Firefox 30, the `当` parameter was not optional.	IE 不支持 No	Opera 15	Safari 6	WebView Android Yes	Chrome Android 18	Firefox Android 26 注意事项 26 注意事项 Before Firefox 30, the `当` parameter was not optional.	Opera Android 14	Safari iOS ?	Samsung Internet Android 1.0

图例

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使用 Web 音频 API

元数据

最后修改： Jan 25, 2020

Web 音频 API
OscillatorNode
构造函数
1. OscillatorNode()
特性
1. detune
2. frequency
3. onended
4. type
方法
1. setPeriodicWave()
2. start()
3. stop()
继承：
1. AudioNode
2. EventTarget
Related pages for Web Audio API

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句法

参数

范例

规范

浏览器兼容性

图例

另请参阅

相关话题