<!DOCTYPE html>
<html>
<head>
<title> 瀏覽器webcamera </title>
<meta name="Generator" content="EditPlus">
<meta name="Author" content="renfufei@qq.com">
<meta name="Description" content="inveted by: http://davidwalsh.name/browser-camera">
<script>
// 設置事件監(jiān)聽，DOM內容加載完成，和jQuery的$.ready() 效果差不多。
window.addEventListener("DOMContentLoaded", function() {
// canvas 元素將用于抓拍
var canvas = document.getElementById("canvas"),
context = canvas.getContext("2d"),
// video 元素，將用于接收并播放攝像頭 的數據流
video = document.getElementById("video"),
videoObj = { "video": true },
// 一個出錯的回調函數，在控制臺打印出錯信息
errBack = function(error) {
if("object" === typeof window.console){
console.log("Video capture error: ", error.code);
}
};
// Put video listeners into place
// 針對標準的瀏覽器
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);
}
// 對拍照按鈕的事件監(jiān)聽
document.getElementById("snap").addEventListener("click", function() {
// 畫到畫布上
context.drawImage(video, 0, 0, 640, 480);
});
}, false);
</script>
</head>
<body>
<div>
<!--
聲明： 此div應該在允許使用webcam，網絡攝像頭之后動態(tài)生成
寬高： 640 *480,當然，可以動態(tài)控制啦!
-->
<!--
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">Snap Photo</button>
<canvas id="canvas" width="640" height="480"></canvas>
</div>
</body>
</html>
