OscillatorNode.frequency

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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

var oscillator = audioCtx.createOscillator();
oscillator.frequency.value = 440; // value in hertz

Note: 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).

// 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();

说明

Specification Status Comment
Web Audio API
frequency		 Working Draft  

浏览器兼容性

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Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 14 webkit (Yes) 23 未实现 15 webkit
22 (unprefixed)		 6 webkit
Feature Android Chrome Edge Firefox Mobile (Gecko) Firefox OS IE Phone Opera Mobile Safari Mobile
Basic support 未实现 28 webkit (Yes) 25 1.2 未实现 未实现 6 webkit

See also