使用JavaScript/HTML5实时生成声音

// use one context per document. Here we are creating one context for one document. You can create for other documents alsovar context = new (window.AudioContext || window.webkitAudioContext)();// oscillatorvar os = context.createOscillator();  os.type = 'sine'; // sine is the default. So you can also use square, saw tooth, triangleos.frequency.value = 500; // setting the frequency Hzos.connect(context.destination); // connecting  to the destination// starting the oscillatoros.start();  os.stop(context.currentTime + 5); // stop 5 seconds after the current time