本文实例讲述了JS实现调用本地摄像头功能。分享给大家供大家参考，具体如下：
今天学习了一下js调用本地摄像头，其实是实现不是很麻烦，下面是代码部分，连接上Tomcat服务器，然后再到网页上打开即可以看到效果了。。快来玩一下吧！
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title></title>
<style>
video {
border: 1px solid #ccc;
display: block;
margin: 0 0 20px 0;
float:left;
}
canvas {
margin-top: 20px;
border: 1px solid #ccc;
display: block;
}
</style>
</head>
<body>
<video width="640" height="480" id="myVideo"></video>
<canvas width="640" height="480" id="myCanvas"></canvas>
<button id="myButton">截图</button>
<button id="myButton2">预览</button>
<button id="myButton3">
<a download="video.png">另存为</a>
</button>
</body>
<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>
</html>
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希望本文所述对大家JavaScript程序设计有所帮助。