OscillatorNode.frequency
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since April 2021.
OscillatorNode
的 frequency 属性的接口
是 a-rate AudioParam
,表示振荡的频率,单位 HZ(hertz)
语法
js
var oscillator = audioCtx.createOscillator();
oscillator.frequency.value = 440; // value in hertz
备注:
虽然返回的 AudioParam
是只读的,但是它表示的值不是。
值
一个 a-rate AudioParam
的值
示例
下列示例使用 AudioContext
创建了一个 oscillator node. 这是一个用于展示的示例,查看 Violent Theremin demo (see app.js 是相关代码).
js
// create web audio api context
var audioCtx = new (window.AudioContext || window.webkitAudioContext)();
// create Oscillator node
var oscillator = audioCtx.createOscillator();
oscillator.type = "square";
oscillator.frequency.value = 440; // value in hertz
oscillator.start();
规范
Specification |
---|
Web Audio API # dom-oscillatornode-frequency |
浏览器兼容性
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