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 diagnostic = document.querySelector('.output');
var bg = document.querySelector('html');
var hints = document.querySelector('.hints');
var colorHTML= '';
colors.forEach(function(v, i, a){
console.log(v, i);
colorHTML += '<span style="background-color:' + v + ';"> ' + v + ' </span>';
});
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;
diagnostic.textContent = 'Result received: ' + color + '.';
bg.style.backgroundColor = color;
console.log('Confidence: ' + event.results[0][0].confidence);
}
recognition.onspeechend = function() {
recognition.stop();
}
recognition.onnomatch = function(event) {
diagnostic.textContent = "I didn't recognise that color.";
}
recognition.onerror = function(event) {
diagnostic.textContent = 'Error occurred in recognition: ' + event.error;
}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);
}<!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>
<link rel="stylesheet" href="style.css">
</head>
<body>
<h1>Speech color changer</h1>
<p class="hints"></p>
<div>
<p class="output"><em>...diagnostic messages</em></p>
</div>
<script src="script.js"></script>
</body>
</html>Chrome至少不会为通过file方案加载的网页提供麦克风权限。您需要启动Web服务器并以这种方式访问页面。