问Google语音识别API几秒钟后停止录制

EN

var streaming = new webkitSpeechRecognition();
streaming.lang = 'en-IN';
streaming.continuous = true;
streaming.interimResults = true; 

streaming.onresult = function(event) {
  l_pos = event.results.length - 1 ;
  console.log(event.results[l_pos][0].transcript);
}

streaming.onend = function(event) {
  console.log("1")
  streaming.start();
  console.log("2")
}

streaming.start();