js调用摄像头拍照上传图片
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<!DOCTYPE html>
<html lang="en">
<head>
<title>js调用摄像头拍照上传图片</title>
<meta charset="utf-8">
</head>
<body>
<button onclick="openMedia()">开启摄像头</button>
<video id="video" width="500px" height="500px" autoplay="autoplay"></video>
<canvas id="canvas" width="500px" height="500px"></canvas>
<button onclick="takePhoto()">拍照</button>
<img id="imgTag" src="" alt="imgTag">
<button onclick="closeMedia()">关闭摄像头</button>
<script>
let mediaStreamTrack=null; // 视频对象(全局)
let video ;
function openMedia() {
let constraints = {
video: { width: 500, height: 500 },
audio: false
};
//获得video摄像头
video = document.getElementById('video');
let promise = navigator.mediaDevices.getUserMedia(constraints);
promise.then((mediaStream) => {
// mediaStreamTrack = typeof mediaStream.stop === 'function' ? mediaStream : mediaStream.getTracks()[1];
mediaStreamTrack=mediaStream.getVideoTracks()
video.srcObject = mediaStream;
video.play();
});
}
// 拍照
function takePhoto() {
//获得Canvas对象
let video = document.getElementById('video');
let canvas = document.getElementById('canvas');
let ctx = canvas.getContext('2d');
ctx.drawImage(video, 0, 0, 500, 500);
// toDataURL --- 可传入'image/png'---默认, 'image/jpeg'
let img = document.getElementById('canvas').toDataURL();
// 这里的img就是得到的图片
console.log('img-----', img);
document.getElementById('imgTag').src=img;
//上传
$.ajax({
url:"/xxxx.do"
,type:"POST"
,data:{"imgData":img}
,success:function(data){
console.log(data);
document.gauges.forEach(function(gauge) {
gauge.value =data.data
});
}
,error:function(){
console.log("服务端异常!");
}
});
}
// 关闭摄像头
function closeMedia() {
let stream = document.getElementById('video').srcObject;
let tracks = stream.getTracks();
tracks.forEach(function(track) {
track.stop();
});
document.getElementById('video').srcObject = null;
}
</script>
</body>
标签:function,js,getElementById,video,let,document,上传,摄像头 来源: https://www.cnblogs.com/bigWebzzL/p/16511787.html