OscillatorNode.frequency

OscillatorNode 的 frequency 属性的接口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。

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

See also