这是
实验性技术
检查
浏览器兼容性表格
要小心谨慎在生产中使用这之前。
rate
特性为
SpeechSynthesisUtterance
interface gets and sets the speed at which the utterance will be spoken at.
If unset, a default value of 1 will be used.
var myRate = speechSynthesisUtteranceInstance.rate; speechSynthesisUtteranceInstance.rate = 1.5;
A float representing the rate value. It can range between 0.1 (lowest) and 10 (highest), with 1 being the default pitch for the current platform or voice, which should correspond to a normal speaking rate. Other values act as a percentage relative to this, so for example 2 is twice as fast, 0.5 is half as fast, etc.
Some speech synthesis engines or voices may constrain the minimum and maximum rates further. If SSML is used, this value will be overridden by prosody tags in the markup.
var synth = window.speechSynthesis;
var inputForm = document.querySelector('form');
var inputTxt = document.querySelector('input');
var voiceSelect = document.querySelector('select');
var voices = synth.getVoices();
...
inputForm.onsubmit = function(event) {
event.preventDefault();
var utterThis = new SpeechSynthesisUtterance(inputTxt.value);
var selectedOption = voiceSelect.selectedOptions[0].getAttribute('data-name');
for(i = 0; i < voices.length ; i++) {
if(voices[i].name === selectedOption) {
utterThis.voice = voices[i];
}
}
utterThis.rate = 1.5;
synth.speak(utterThis);
inputTxt.blur();
}
| 规范 | 状态 | 注释 |
|---|---|---|
|
Web 语音 API
The definition of 'rate' in that specification. |
草案 |
| 桌面 | 移动 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
rate
|
Chrome 33 | Edge 14 | Firefox 49 | IE 不支持 No | Opera 21 | Safari 7 | WebView Android 不支持 No | Chrome Android 33 | Firefox Android 62 | Opera Android 不支持 No | Safari iOS 7 | Samsung Internet Android 3.0 |
完整支持
不支持
实验。期望将来行为有所改变。
用户必须明确启用此特征。