移动端 getUserMedia 报错

用 node 打开，pc 可以正确执行，放在手机上会报错 NavigatorUserMediaError {name: "PermissionDeniedError", message: "", constraintName: ""}

//html
<video id="video" width="640" height="480"></video>
<button id="picture" type="button" name="button">拍摄</button>
<canvas id="canvas" width="640" height="480"></canvas>

// js
var video = document.getElementById("video");
var context = canvas.getContext("2d");
var button = document.getElementById("button")

navigator.getUserMedia = (navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia);

navigator.getUserMedia({
  video: true,
  audio: true
},function(localMediaStream) {
  video.src = window.URL.createObjectURL(localMediaStream);
  video.play();
},function(err){
  console.log(err)
})

button.addEventListener("click", function () {
  context.drawImage(video, 0, 0, 640, 480);
});

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手机端还没有多少支持的