创建一个将文本转换为语音的 Web 应用程序听起来很酷，如果所有这些功能都可用而不受任何第三方库的干扰，那么实现起来就更容易了。 Web 语音 API 提供了基本工具，可用于创建启用语音数据的交互式 Web 应用程序。我们创建了一个基本界面，其中包含一个简单的框，其中包含我们将在其中编写文本的文本输入部分，以及两个用于控制语音速度及其音调的滑块。然后我们有一个下拉菜单，其中包含所有受支持的语言以及其中提到的地区。
index.html这个 HTML 文件包含网页的布局。
Text to speech!
style.css这个文件用来给 HTML 文件添加一些 CSS 样式。
body {
background: url('images/background.jpg');
background-size: cover;
background-repeat: no-repeat;
height: 100vh;
background-attachment: fixed;
}
#front-text {
font-size: 35px;
color: white;
font-weight: bolder;
text-shadow: 1px 1px 1px black;
display: block;
position: relative;
margin-bottom: 5%;
margin-top: 15%;
}
#rate-value {
float: right;
}
#pitch-value {
float: right;
}
#foot {
font-size: 20px;
color: white;
font-weight: bolder;
display: block;
position: relative;
margin-top: 1%;
}
main.js JavaScript 文件用于将文本文件转换为语音。
// Initialising the speech API
const synth = window.speechSynthesis;
// Element initialization section
const form = document.querySelector('form');
const textarea = document.getElementById('maintext');
const voice_select = document.getElementById('voice-select');
const rate = document.getElementById('rate');
const pitch = document.getElementById('pitch');
const rateval = document.getElementById('rate-value');
const pitchval = document.getElementById('pitch-value');
// Retrieving the different voices and putting them as
// options in our speech selection section
let voices = [];
const getVoice = () => {
// This method retrieves voices and is asynchronously loaded
voices = synth.getVoices();
var option_string = "";
voices.forEach(value => {
var option = value.name + ' (' + value.lang + ') ';
var newOption = "\n";
option_string += newOption;
});
voice_select.innerHTML = option_string;
}
// Since synth.getVoices() is loaded asynchronously, this
// event gets fired when the return object of that
// function has changed
synth.onvoiceschanged = function() {
getVoice();
};
const speak = () => {
// If the speech mode is on we dont want to load
// another speech
if(synth.speaking) {
alert('Already speaking....');
return;
}
// If the text area is not empty that is if the input
// is not empty
if(textarea.value !== '') {
// Creating an object of SpeechSynthesisUtterance with
// the input value that represents a speech request
const speakText = new SpeechSynthesisUtterance(textarea.value);
// When the speaking is ended this method is fired
speakText.onend = e => {
console.log('Speaking is done!');
};
// When any error occurs this method is fired
speakText.error = e=> {
console.error('Error occured...');
};
// Selecting the voice for the speech from the selection DOM
const id = voice_select.selectedIndex;
const selectedVoice =
voice_select.selectedOptions[0].getAttribute('data-name');
// Checking which voices has been chosen from the selection
// and setting the voice to the chosen voice
voices.forEach(voice => {
if(voice.name === selectedVoice) {
speakText.voice = voice;
}
});
// Setting the rate and pitch of the voice
speakText.rate = rate.value;
speakText.pitch = pitch.value;
// Finally calling the speech function that enables speech
synth.speak(speakText);
}
};
// This function updates the rate and pitch value to the
// value to display
rate.addEventListener('change', evt => rateval.innerHTML
= (Number.parseFloat(rate.value) * 10) + "");
pitch.addEventListener('change', evt => pitchval.innerHTML
= (Number.parseFloat(pitch.value) * 10) + "");
// This is the section when we assign the speak button, the
// speech function
form.addEventListener('submit', evt => {
evt.preventDefault();
speak();
textarea.blur();
});
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