<!DOCTYPE html>
<
html
>
<
head
>
<
meta
charset
=
"UTF-8"
>
<
title
>Document</
title
>
<
style
>
video {
border: 1px solid #ccc;
display: block;
margin: 0 0 20px 0;
float:left;
}
#canvas {
margin-top: 20px;
border: 1px solid #ccc;
display: block;
}
</
style
>
</
head
>
<
body
>
<
video
id
=
"video"
width
=
"500"
height
=
"400"
autoplay></
video
>
<
canvas
id
=
"canvas"
width
=
"500"
height
=
"400"
></
canvas
>
<
button
id
=
"snap"
>拍照</
button
>
<
script
type
=
"text/javascript"
>
var context = canvas.getContext("2d");
//当DOM树构建完成的时候就会执行DOMContentLoaded事件
window.addEventListener("DOMContentLoaded", function() {
//获得Canvas对象
var canvas = document.getElementById("canvas");
//获得video摄像头区域
var video = document.getElementById("video");
var videoObj = {
"video" : true
};
var errBack = function(error) {
console.log("Video capture error: ", error.code);
};
//获得摄像头并显示到video区域
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);
} else if (navigator.mozGetUserMedia) { // Firefox-prefixed
navigator.mozGetUserMedia(videoObj, function(stream) {
video.src = window.URL.createObjectURL(stream);
video.play();
}, errBack);
}
}, false);
// 触发拍照动作
document.getElementById("snap").addEventListener("click", function() {
context.drawImage(video, 0, 0, 640, 480);
});
</
script
>
</
body
>
</
html
>