效果圖： 整體效果:
視頻加載：
拍照：
第一步：創(chuàng)建HTML元素
首先，我們要?jiǎng)?chuàng)建一個(gè)HTML5的文檔。
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>無標(biāo)題文檔</title>
</head>
<body>
</body>
</html>
然后在<body></body>插入以下代碼：
<video id="video" width="640" height="480" autoplay></video>
<button id="snap">截圖</button>
<canvas id="canvas" width="640" height="480"></canvas>
第二步：創(chuàng)建JavaScript
首先，要在<head></head>里創(chuàng)建一個(gè)JavaScript：
<script language="javascript">
// Grab elements, create settings, etc.
var video = document.getElementById('video');
// Get access to the camera!
if(navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
// Not adding `{ audio: true }` since we only want video now
navigator.mediaDevices.getUserMedia({ video: true }).then(function(stream) {
//video.src = window.URL.createObjectURL(stream);
video.srcObject = stream;
video.play();
});
}
/* Legacy code below: getUserMedia
else if(navigator.getUserMedia) { // Standard
navigator.getUserMedia({ video: true }, function(stream) {
video.src = stream;
video.play();
}, errBack);
} else if(navigator.webkitGetUserMedia) { // WebKit-prefixed
navigator.webkitGetUserMedia({ video: true }, function(stream){
video.src = window.webkitURL.createObjectURL(stream);
video.play();
}, errBack);
} else if(navigator.mozGetUserMedia) { // Mozilla-prefixed
navigator.mozGetUserMedia({ video: true }, function(stream){
video.srcObject = stream;
video.play();
}, errBack);
}
*/
</script>
隨后，要在剛才創(chuàng)建的HTML元素的后面插入以下代碼：
<script language="javascript">
// Elements for taking the snapshot
var canvas = document.getElementById('canvas');
var context = canvas.getContext('2d');
var video = document.getElementById('video');
// Trigger photo take
document.getElementById("snap").addEventListener("click", function() {
context.drawImage(video, 0, 0, 640, 480);
});
</script>
現(xiàn)在，這個(gè)HTML就可以完成打開攝像頭，和拍照的功能了！
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