求教js如何关闭网页摄像头

[zzh_hzz]

我用js 的navigator.getUserMedia打开了摄像头，应该怎么样用js来关闭呢，求大神帮忙

[lh1003]

//摄像头相关部分
var mediaStreamTrack;


var vendorUrl = window.URL || window.webkitURL;
if (carmerState1 == 1) {
//媒体对象
navigator.getMedia = navigator.getUserMedia ||
navagator.webkitGetUserMedia ||
navigator.mozGetUserMedia ||
navigator.msGetUserMedia;
navigator.getMedia({
video: true, //使用摄像头对象
}, function (stream) {
mediaStreamTrack = stream;
}, function (error) {
console.log(error);
});
} else {
mediaStreamTrack.getTracks()[0].stop(); //关闭摄像头
}