关闭chrome访问麦克风标签页上小红点的方法

<span style="font-family: Arial, Helvetica, sans-serif;">navigator.getMedia = ( navigator.getUserMedia ||</span>

navigator.webkitGetUserMedia ||
navigator.mozGetUserMedia ||
navigator.msGetUserMedia);

navigator.getMedia (

// constraints
{
video: true,
audio: true
},

// successCallback
function(localMediaStream) {
var video = document.querySelector('video');
video.src = window.URL.createObjectURL(localMediaStream);
video.onloadedmetadata = function(e) {
// Do something with the video here.
};
},

// errorCallback
function(err) {
console.log("The following error occured: " + err);
}

);