OscillatorNode.frequency - Web API 接口参考 编辑

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

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

• Desktop
• Mobile

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

• Using the Web Audio API