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.
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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 |