极客观点
项目管理
HarmonyOS
最终目的是在微信端调用摄像头实现拍照功能，目前只在火狐下能用，谷歌都不行。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<video src="" id="video"></video>
<canvas id="canvas1" height="120px" ></canvas><hr />
<input type="button" title="视频" value="视频" onclick="getVedio();" /><br />
</body>
<script>
var canvas1 = document.getElementById('canvas1');
var context1 = canvas1.getContext('2d');
var promisifiedOldGUM = function(constraints){
var getUserMedia = (navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia);
if(!getUserMedia){
return Promise.reject(new Error('getUserMedia is not work'))
}
return new Promise(function(resolve,reject){
getUserMedia.call(navigator,constraints,resolve,reject);
})
}
if(navigator.mediaDevices.getUserMedia === undefined){
navigator.mediaDevices.getUserMedia = promisifiedOldGUM;
}
var constraints = {audio:true,video:{width:1280,height:720}};
navigator.mediaDevices.getUserMedia(constraints)
.then(function(stream){
var video = document.querySelector('video');
video.src = window.URL && window.URL.createObjectURL(stream) || stream;
video.onloadedmetadata = function(e){
video.play();
};
})
.catch(function(err){
console.log(err.name+":"+err.message);
})
function drawVideoAtCanvas(video,context) {
window.setInterval(function () {
context.drawImage(video, 0, 0,90,120);
}, 60);
}
function getVedio() {
drawVideoAtCanvas(video, context1);
}
</script>
</html>
html5