Web调取摄像头拍照

调取摄像头、拍照

<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<video width="640" height="480" id="myVideo"></video>
<canvas width="640" height="480" id="myCanvas"></canvas>
<button id="myButton">拍摄</button>
<button id="myButton2">预览</button>
<button id="myButton3">
<a download="video.png">另存为</a>
</button>
</body>
</html>

js 调用

<script>
window.addEventListener('DOMContentLoaded',function(){
var cobj=document.getElementById('myCanvas').getContext('2d');
var vobj=document.getElementById('myVideo');
getUserMedia({video:true},function(stream){
vobj.src=stream;
vobj.play();
},function(){});
document.getElementById('myButton').addEventListener('click',function(){
cobj.drawImage(vobj,0,0,640,480);
document.getElementById('myButton3').children[0].href=cobj.canvas.toDataURL("image/png");
},false);
document.getElementById('myButton2').addEventListener('click',function(){
window.open(cobj.canvas.toDataURL("image/png"),'_blank');
},false);
},false);
function getUserMedia(obj,success,error){
if(navigator.getUserMedia){
getUserMedia=function(obj,success,error){
navigator.getUserMedia(obj,function(stream){
success(stream);
},error);
}
}else if(navigator.webkitGetUserMedia){
getUserMedia=function(obj,success,error){
navigator.webkitGetUserMedia(obj,function(stream){
var _URL=window.URL || window.webkitURL;
success(_URL.createObjectURL(stream));
},error);
}
}else if(navigator.mozGetUserMedia){
getUserMedia=function(obj,success,error){
navigator.mozGetUserMedia(obj,function(stream){
success(window.URL.createObjectURL(stream));
},error);
}
}else{
return false;
}
return getUserMedia(obj,success,error);
}
</script>

 

posted @ 2017-03-24 16:23  你也很优秀  阅读(3802)  评论(0)  编辑  收藏  举报