SpeechRecognition.maxAlternatives

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句法
范例
规范
浏览器兼容性
另请参阅
相关话题

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。

maxAlternatives 特性为 SpeechRecognition interface sets the maximum number of SpeechRecognitionAlternative s provided per SpeechRecognitionResult .

默认值为 1。

句法

var myMaxAlternativeNumber = mySpeechRecognition.maxAlternatives;
mySpeechRecognition.maxAlternatives = 2;

值

A number representing the maximum returned alternatives for each result.

范例

This code is excerpted from our Speech color changer 范例。

var grammar = '#JSGF V1.0; grammar colors; public <color> = 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 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;
...

规范

规范	状态	注释
Web 语音 API The definition of 'maxAlternatives' in that specification.	草案

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`maxAlternatives`	Chrome 33 Prefixed 注意事项 33 Prefixed 注意事项 Prefixed Implemented with the vendor prefix: webkit You'll need to serve your code through a web server for recognition to work.	Edge ≤79 Prefixed 注意事项 ≤79 Prefixed 注意事项 Prefixed Implemented with the vendor prefix: webkit You'll need to serve your code through a web server for recognition to work.	Firefox 不支持 No	IE 不支持 No	Opera 不支持 No	Safari 不支持 No	WebView Android Yes Prefixed 注意事项 Yes Prefixed 注意事项 Prefixed Implemented with the vendor prefix: webkit You'll need to serve your code through a web server for recognition to work.	Chrome Android Yes Prefixed 注意事项 Yes Prefixed 注意事项 Prefixed Implemented with the vendor prefix: webkit You'll need to serve your code through a web server for recognition to work.	Firefox Android 不支持 No	Opera Android 不支持 No	Safari iOS 不支持 No	Samsung Internet Android Yes Prefixed 注意事项 Yes Prefixed 注意事项 Prefixed Implemented with the vendor prefix: webkit You'll need to serve your code through a web server for recognition to work.

图例

完整支持
不支持
实验。期望将来行为有所改变。

要求使用供应商前缀或不同名称。

Firefox OS permissions

To use speech recognition in an app, you need to specify the following permissions in your manifest :

"permissions": {
  "audio-capture" : {
    "description" : "Audio capture"
  },
  "speech-recognition" : {
    "description" : "Speech recognition"
  }
}

You also need a privileged app, so you need to include this as well:

  "type": "privileged"

另请参阅

Web 语音 API

元数据

最后修改： 2020 年 1 月 22 日

SpeechRecognition
构造函数
1. SpeechRecognition()
特性
1. continuous
2. grammars
3. interimResults
4. lang
5. maxAlternatives
6. onaudioend
7. onaudiostart
8. onend
9. onerror
10. onnomatch
11. onresult
12. onsoundend
13. onsoundstart
14. onspeechend
15. onspeechstart
16. onstart
17. serviceURI
方法
事件
1. audioend
2. audiostart
3. end
4. error
5. nomatch
6. result
7. soundend
8. soundstart
9. speechend
10. speechstart
11. start
继承：
1. EventTarget
Related pages for Web Speech API

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句法

值

范例

规范

浏览器兼容性

图例

Firefox OS permissions

另请参阅

相关话题