HTML5从默认麦克风捕获音频

// success callback when requesting audio input stream
function successCallback(stream) {
    var audioContext = new (window.webkitaudiocontext)();

    // Create an AudioNode from the stream.
    var mediastreamsource = audioContext.createmediastreamsource( stream );

    // Connect it to the destination to hear yourself (or any other node for processing!)
    mediastreamsource.connect( audioContext.destination );
}

function errorCallback() {
    console.log("The following error occurred: " + err);
}

navigator.webkitGetUserMedia( {audio:true},successCallback,errorCallback );