建立

我们首先创建一个音频上下文，然后创建一个振荡器，这是检查你的设置是否有效的最简单方法。 （示例小提琴）

// We can either use the standard AudioContext or the webkitAudioContext (Safari)
var audioContext = (window.AudioContext || window.webkitAudioContext);

// We create a context from which we will create all web audio nodes
var context = new audioContext();

// Create an oscillator and make some noise
var osc = context.createOscillator();

// set a frequecy, in this case 440Hz which is an A note
osc.frequency.value = 440;

// connect the oscillator to the context destination (which routes to your speakers)
osc.connect(context.destination);

// start the sound right away
osc.start(context.currentTime);

// stop the sound in a second
osc.stop(context.currentTime + 1);