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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See also