uweb/zh/searchurl/js/beep.js

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JavaScript
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//data:charset=utf-8,
var audioCtx = new window.AudioContext;
function beep(duration, frequency, volume, type, callback) {
var oscillator = audioCtx.createOscillator();
var gainNode = audioCtx.createGain();
oscillator.connect(gainNode);
gainNode.connect(audioCtx.destination);
if (volume){gainNode.gain.value = volume;}
if (frequency){oscillator.frequency.value = frequency;}
if (type){oscillator.type = type;}
if (callback){oscillator.onended = callback;}
oscillator.start(audioCtx.currentTime);
oscillator.stop(audioCtx.currentTime + ((duration || 500) / 1000));
};
beep();
self.close();