注意：非端口地址打开无效（会报函数未知错误）
正确方式：ip+端口+文件位置
如：放到webstorm中通过其自带打开方式打开。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>js 获取视频 demo</title>
<style>
#video{
/*镜子模式*/
transform: rotateY(-180deg);
}
</style>
</head>
<body>
<video id="video" width="640" height="480" autoplay></video>
<button id="snap">Snap Photo</button>
<canvas id="canvas" width="640" height="480"></canvas>
</body>
<script type="text/javascript">
// Put event listeners into place
window.addEventListener("DOMContentLoaded", function() {
// Grab elements, create settings, etc.
var canvas = document.getElementById("canvas"),
context = canvas.getContext("2d"), //getContext唯一合法值2d
video = document.getElementById("video"),
videoObj = {
"video": true,
"audio": true
},
errBack = function(error) {
console.log("Video capture error: ", error.code);
};
// Put video listeners into place
//navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia;
if (navigator.getUserMedia) { // Standard 如果用户允许打开摄像头
//stream为读取的视频流
navigator.getUserMedia(videoObj, function(stream) {
video.src = stream;
video.play();
}, errBack);
} else if (navigator.webkitGetUserMedia) { // WebKit-prefixed 根据不同的浏览器写法不同
navigator.webkitGetUserMedia(videoObj, function(stream) {
video.src = window.webkitURL.createObjectURL(stream);
video.play();
}, errBack);
} else if (navigator.mozGetUserMedia) { // Firefox-prefixed
navigator.mozGetUserMedia(videoObj, function(stream) {
video.src = window.URL.createObjectURL(stream);
video.play();
}, errBack);
}
document.getElementById("snap").addEventListener("click", function() {
context.drawImage(video, 0, 0, 640, 480);
});
}, false);
</script>
</html>
注意：非端口地址打开无效（会报函数未知错误）
正确方式：ip+端口+文件位置
如：放到
阅读背景：
采集摄像头信息+截图
来源：互联网
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