SpeechSynthesisUtterance: start event

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start event of the Web 语音 API SpeechSynthesisUtterance object is fired when the utterance has begun to be spoken.

可以使用 start event in an addEventListener 方法：

utterThis.addEventListener('start', function(event) {
  console.log('We have started uttering this speech: ' + event.utterance.text);
});

或使用 onstart 事件处理程序特性：

utterThis.onstart = function(event) {
  console.log('We have started uttering this speech: ' + event.utterance.text);
}

规范	状态	注释
Web 语音 API The definition of 'speech synthesis utterance events' in that specification.	草案

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