Function Speaker

Speaker(text, lang?, volume?, pitch?, rate?): {
    getInstance: (() => SpeechSynthesisUtterance);
    getVoices: (() => SpeechSynthesisVoice[]);
    setLang: ((lang: string) => void);
    setPitch: ((pitch: number) => void);
    setRate: ((rate: number) => void);
    setText: ((txt: string) => void);
    setVoice: ((voice: any) => void);
    setVolume: ((volume: number) => void);
    speak: (() => void);
    stop: (() => void);
}
TTS 语音，可以在现代浏览器直接运行。
Parameters
- text: string
  内容
- lang: string = 'zh-CN'
  语言
- volume: number = 1
  音量 [0, 1]
- pitch: number = 1
  音高 [0, 2]
- rate: number = 1
  速度 [0.1, 10]
Returns {
    getInstance: (() => SpeechSynthesisUtterance);
    getVoices: (() => SpeechSynthesisVoice[]);
    setLang: ((lang: string) => void);
    setPitch: ((pitch: number) => void);
    setRate: ((rate: number) => void);
    setText: ((txt: string) => void);
    setVoice: ((voice: any) => void);
    setVolume: ((volume: number) => void);
    speak: (() => void);
    stop: (() => void);
}
- getInstance: (() => SpeechSynthesisUtterance)
  - - (): SpeechSynthesisUtterance
    - Returns SpeechSynthesisUtterance
- getVoices: (() => SpeechSynthesisVoice[])
  - - (): SpeechSynthesisVoice[]
    - Returns SpeechSynthesisVoice[]
- setLang: ((lang: string) => void)
  - - (lang): void
    - Parameters
      lang: string
      Returns void
- setPitch: ((pitch: number) => void)
  - - (pitch): void
    - Parameters
      pitch: number
      Returns void
- setRate: ((rate: number) => void)
  - - (rate): void
    - Parameters
      rate: number
      Returns void
- setText: ((txt: string) => void)
  - - (txt): void
    - Parameters
      txt: string
      Returns void
- setVoice: ((voice: any) => void)
  - - (voice): void
    - Parameters
      voice: any
      Returns void
- setVolume: ((volume: number) => void)
  - - (volume): void
    - Parameters
      volume: number
      Returns void
- speak: (() => void)
  - - (): void
    - Returns void
- stop: (() => void)
  - - (): void
    - Returns void
Example
```
const mySpeaker = Speaker();
mySpeaker.setText('你好，这是一条测试语音！hello');
mySpeaker.speak();
```