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在HTML里加载摄像头的方法

时间：2020-10-11来源：www.pcxitongcheng.com作者：电脑系统城

效果图：整体效果:

视频加载：

拍照：

第一步：创建HTML元素

首先，我们要创建一个HTML5的文档。

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10 <!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
</head>

<body>
</body>
</html>

然后在<body></body>插入以下代码：

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3 <video id="video" width="640" height="480" autoplay></video>
<button id="snap">截图</button>
<canvas id="canvas" width="640" height="480"></canvas>

第二步：创建JavaScript

首先，要在<head></head>里创建一个JavaScript：

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32 <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>

// 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>

随后，要在刚才创建的HTML元素的后面插入以下代码：

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11 <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>