基于新的HTML5标准,浏览器终于开始支持语言识别和语音合成,即文字朗读和语音输入。
注:在chrome浏览器下要调用麦克风 必须在可信的http域下(http://localhost 或 https://)
文字朗读:
var utterThis = new window.SpeechSynthesisUtterance('Hello world!');
window.speechSynthesis.speak(utterThis);
语音识别:
var SpeechRecognition = SpeechRecognition || webkitSpeechRecognition
var SpeechGrammarList = SpeechGrammarList || webkitSpeechGrammarList
var SpeechRecognitionEvent = SpeechRecognitionEvent || webkitSpeechRecognitionEvent
var colors = [ 'aqua' , 'azure' , 'beige', 'bisque', 'black', 'blue', 'brown', 'chocolate', 'coral', 'crimson', 'cyan', 'fuchsia', 'ghostwhite', 'gold', 'goldenrod', 'gray', 'green', 'indigo', 'ivory', 'khaki', 'lavender', 'lime', 'linen', 'magenta', 'maroon', 'moccasin', 'navy', 'olive', 'orange', 'orchid', 'peru', 'pink', 'plum', 'purple', 'red', 'salmon', 'sienna', 'silver', 'snow', 'tan', 'teal', 'thistle', 'tomato', 'turquoise', 'violet', 'white', 'yellow'];
var grammar = '#JSGF V1.0; grammar colors; public <color> = ' + colors.join(' | ') + ' ;'
var recognition = new SpeechRecognition();
var speechRecognitionList = new SpeechGrammarList();
speechRecognitionList.addFromString(grammar, 1);
recognition.grammars = speechRecognitionList;
//recognition.continuous = false;
recognition.lang = 'en-US';
recognition.interimResults = false;
recognition.maxAlternatives = 1;
document.body.onclick = function() {
recognition.start();
console.log('Ready to receive a color command.');
}
recognition.onresult = function(event) {
var last = event.results.length - 1;
var color = event.results[last][0].transcript;
document.querySelector('.output').textContent = 'Result received: ' + color + '.';
document.querySelector('html').style.backgroundColor = color;
console.log('Confidence: ' + event.results[0][0].confidence);
var utterThis = new window.SpeechSynthesisUtterance('You said ' + color);
window.speechSynthesis.speak(utterThis);
}
recognition.onspeechend = function() {
recognition.stop();
}
recognition.onnomatch = function(event) {
document.querySelector('.output').textContent = "I didn't recognise that color.";
}
recognition.onerror = function(event) {
document.querySelector('.output').textContent = 'Error occurred in recognition: ' + event.error;
}
完整示例:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width">
<title>Speech color changer</title>
<style>
body,html{margin:0;}
html{height:100%;}
body{height:inherit;overflow:hidden;}
h1,p{font-family:sans-serif;text-align:center;padding:20px;}
div{height:100px;overflow:auto;position:absolute;bottom:0px;right:0;left:0;background-color:rgba(255,255,255,0.2);}
ul{margin:0;}
.hints span{text-shadow:0px 0px 6px rgba(255,255,255,0.7);}
</style>
</head>
<body>
<h1>Speech color changer</h1>
<p class="hints"></p>
<div>
<p class="output"><em>...diagnostic messages</em></p>
</div>
<script>
var SpeechRecognition = SpeechRecognition || webkitSpeechRecognition
var SpeechGrammarList = SpeechGrammarList || webkitSpeechGrammarList
var SpeechRecognitionEvent = SpeechRecognitionEvent || webkitSpeechRecognitionEvent
var colors = [ 'aqua' , 'azure' , 'beige', 'bisque', 'black', 'blue', 'brown', 'chocolate', 'coral', 'crimson', 'cyan', 'fuchsia', 'ghostwhite', 'gold', 'goldenrod', 'gray', 'green', 'indigo', 'ivory', 'khaki', 'lavender', 'lime', 'linen', 'magenta', 'maroon', 'moccasin', 'navy', 'olive', 'orange', 'orchid', 'peru', 'pink', 'plum', 'purple', 'red', 'salmon', 'sienna', 'silver', 'snow', 'tan', 'teal', 'thistle', 'tomato', 'turquoise', 'violet', 'white', 'yellow'];
var grammar = '#JSGF V1.0; grammar colors; public <color> = ' + colors.join(' | ') + ' ;'
var recognition = new SpeechRecognition();
var speechRecognitionList = new SpeechGrammarList();
speechRecognitionList.addFromString(grammar, 1);
recognition.grammars = speechRecognitionList;
//recognition.continuous = false;
recognition.lang = 'en-US';
recognition.interimResults = false;
recognition.maxAlternatives = 1;
var colorHTML= '';
colors.forEach(function(v, i, a){
console.log(v, i);
colorHTML += '<span style="background-color:' + v + ';"> ' + v + ' </span>';
});
document.querySelector('.hints').innerHTML = 'Tap/click then say a color to change the background color of the app. Try '+ colorHTML + '.';
document.body.onclick = function() {
recognition.start();
console.log('Ready to receive a color command.');
}
recognition.onresult = function(event) {
// The SpeechRecognitionEvent results property returns a SpeechRecognitionResultList object
// The SpeechRecognitionResultList object contains SpeechRecognitionResult objects.
// It has a getter so it can be accessed like an array
// The [last] returns the SpeechRecognitionResult at the last position.
// Each SpeechRecognitionResult object contains SpeechRecognitionAlternative objects that contain individual results.
// These also have getters so they can be accessed like arrays.
// The [0] returns the SpeechRecognitionAlternative at position 0.
// We then return the transcript property of the SpeechRecognitionAlternative object
var last = event.results.length - 1;
var color = event.results[last][0].transcript;
document.querySelector('.output').textContent = 'Result received: ' + color + '.';
document.querySelector('html').style.backgroundColor = color;
console.log('Confidence: ' + event.results[0][0].confidence);
var utterThis = new window.SpeechSynthesisUtterance('You said ' + color);
window.speechSynthesis.speak(utterThis);
}
recognition.onspeechend = function() {
recognition.stop();
}
recognition.onnomatch = function(event) {
document.querySelector('.output').textContent = "I didn't recognise that color.";
}
recognition.onerror = function(event) {
document.querySelector('.output').textContent = 'Error occurred in recognition: ' + event.error;
}
</script>
</body>
</html>
测试地址:http://haiyang.me/html5/speechSynthesis.html