在创建webkitSpeechRecognition
实例后,知道用户是否允许麦克风访问的最佳方法是什么?
webkitSpeechRecognition:onstart
方法来更新本地状态引用:
var permission = false;
var recognition = new webkitSpeechRecognition();
recognition.continuous = true;
recognition.interimResults = true;
recognition.onstart = function() { permission = true; }
但是这似乎是多余的,因为浏览器可能已经设置了全局只读值。
任何想法吗?
根据Google的例子,似乎没有浏览器范围的属性来声明用户的权限。
正确的解决方案(就目前而言)是侦听onstart
和onend
事件以在语音识别逻辑范围内设置属性
var permission = false;
var recognition = new webkitSpeechRecognition();
recognition.continuous = true;
recognition.interimResults = true;
// Start event is fired when user accept
recognition.onstart = function() {
permission = true;
}
// End event is fired when the permission expire
recognition.onend = function() {
permission = false;
}
recognition.start();