如何在JavaScript中切换前置摄像头和后置摄像头？

3qpi33ja 于 2023-05-16 发布在 Java

关注(0)|答案(1)|浏览(352)

let constraints;
function handleVideo(){
const constraints = {
  video: {
    facingMode: {
      exact: 'user'
    }
  }
};

var video;
navigator.mediaDevices.getUserMedia(constraints).
then((stream) => {
  video = document.createElement("video")
  video.srcObject = stream
  video.play()
  video.onloadeddata = () => {
    ctx.height = video.videoHeight
  }
})
}

我知道通过将exact更改为environment可以在前后摄像头之间切换。但我不知道怎么点击。

JavaScript

来源：https://stackoverflow.com/questions/72420950/how-to-switch-between-front-camera-and-rear-camera-in-javascript

1条答案

按热度按时间

r55awzrz1#

就像这样：

function handleVideo(cameraFacing) {
  const constraints = {
    video: {
      facingMode: {
        exact: cameraFacing
      }
    }
  }
  return constraints
};

function turnVideo(constraints) {
  let video;
  navigator.mediaDevices.getUserMedia(constraints)
    .then((stream) => {
      video = document.createElement("video")
      video.srcObject = stream
      video.play()
      video.onloadeddata = () => {
        ctx.height = video.videoHeight
      }
    })

}

document.querySelector(".frontCamera").addEventListener("click", () => {
  turnVideo(handleVideo("user"));
})
document.querySelector(".backCamera").addEventListener("click", () => {
  turnVideo(handleVideo("environment"));
})

<div class="frontCamera">front</div>
<div class="backCamera">back</div>

赞(0）回复(0）举报 2023-05-16

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如何在JavaScript中切换前置摄像头和后置摄像头？

1条答案

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