怎样在网页中使用摄像头，html5越来越多的使用到实际工作中，那么他怎样调用摄像头呢进行视频聊天，视频监控等活动呢，今天为大家抛砖引玉，教大家怎样实现怎样利用html5实现摄像头视频监控功能。废话不多说，接入正题：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>HTML5使用video实现摄像头</title>
<style>
nav .search {
display: none;
}
.demoFrame header,
.demoFrame .footer,
.demoFrame h1,
.demoFrame .p {
display: none !important;
}
h1 {
font-size: 2.6em;
}
h2, h3 {
font-size: 1.7em;
}
.left {
width: 920px !important;
padding-bottom: 40px;
}
div.p {
font-size: .8em;
font-family: arial;
margin-top: -20px;
font-style: italic;
padding: 10px 0;
}
.footer {
padding: 20px;
margin: 20px 0 0 0;
background: #f8f8f8;
font-weight: bold;
font-family: arial;
border-top: 1px solid #ccc;
}
.left > p:first-of-type {
background: #ffd987;
font-style: italic;
padding: 5px 10px;
margin-bottom: 40px;
}
#promoNode {
margin: 20px 0;
}
video { border: 1px solid #ccc; display: block; margin: 0 0 20px 0; }
#canvas { margin-top: 20px; border: 1px solid #ccc; display: block; }
</style>
</head>
<body>
<!-- Add the HTML header -->
<div id="page">
<!-- holds content, will be frequently changed -->
<div id="contentHolder">
<!-- start the left section if not the homepage -->
<section class="left">
<h1>HTML5使用video控件实现摄像头录像抓图效果</h1>
<div class="p">Read <a href="http://davidwalsh.name/browser-camera" target="_top">Camera and Video Control with HTML5</a></div>
<div id="promoNode"></div>
<p>请使用Opera或Chrome浏览器, 可以在该页面抓图!</p>
<!--
Ideally these elements aren”t created until it”s confirmed that the
client supports video/camera, but for the sake of illustrating the
elements involved, they are created with markup (not JavaScript)
-->
<video id="video" width="640" height="480" autoplay></video>
<button id="snap" class="sexyButton">Snap Photo</button>
<canvas id="canvas" width="640" height="480"></canvas>
<script>
// Put event listeners into place
window.addEventListener("DOMContentLoaded", function() {
// Grab elements, create settings, etc.
var canvas = document.getElementById("canvas"),
context = canvas.getContext("2d"),
video = document.getElementById("video"),
videoObj = { "video": true },
errBack = function(error) {
console.log("Video capture error: ", error.code);
};
// Put video listeners into place
if(navigator.getUserMedia) { // Standard
navigator.getUserMedia(videoObj, function(stream) {
video.src = stream;
video.play();
}, errBack);
} else if(navigator.webkitGetUserMedia) { // WebKit-prefixed
navigator.webkitGetUserMedia(videoObj, function(stream){
video.src = window.webkitURL.createObjectURL(stream);
video.play();
}, errBack);
}
// Trigger photo take
document.getElementById("snap").addEventListener("click", function() {
context.drawImage(video, 0, 0, 640, 480);
});
}, false);
</script>
</section>
</div>
</body>
</html>
以上是html5实现摄像头的网站代码，而且可以执行运行，主要使用的就是video控件，然后使用浏览器获取媒体getUserMedia，然后获取到媒体的视频流，使用video的src属性进行输出，然后播放，希望对大家有所帮助。