<!DOCTYPE html>
<html>
<head>
<title>js调用摄像头</title>
<style>
#camera{
float: left;
margin: 20px;
}
#contentHolder{
width: 300px;
height: 300px;
margin-bottom: 10px;
}
#btn_snap{
margin: 0 auto;
border: 1px solid #f0f0f0;
background: #5CACEE;
color: #FFF;
width: 100px;
height: 36px;
line-height: 36px;
border-radius: 8px;
text-align: center;
cursor: pointer;
cursor: pointer;
/*禁止选择*/
-webkit-touch-callout: none; /* iOS Safari */
-webkit-user-select: none; /* Chrome/Safari/Opera */
-khtml-user-select: none; /* Konqueror */
-moz-user-select: none; /* Firefox */
-ms-user-select: none; /* Internet Explorer/Edge */
user-select: none; /* Non-prefixed version, currently not supported by any browser */
}
#imgBoxxx{
width: 200px;
margin: 60px 20px 20px;
}
</style>
</head>
<body>
<div id="camera">
<div id="contentHolder">
<video id="video" width="300" height="300" autoplay></video>
<canvas style="display:none;" id="canvas" width="300" height="300"></canvas>
</div>
<div id="btn_snap">拍照</div>
</div>
<script>
var canvas = document.getElementById("canvas"),
pzBtn = document.getElementById("btn_snap"),
context = canvas.getContext("2d"),
video = document.getElementById("video");
alert('该页面会调用您的摄像头')
// 旧版本浏览器可能根本不支持mediaDevices，我们首先设置一个空对象
if (navigator.mediaDevices === undefined) {
navigator.mediaDevices = {};
}
// 一些浏览器实现了部分mediaDevices，我们不能只分配一个对象
// 使用getUserMedia，因为它会覆盖现有的属性。
// 这里，如果缺少getUserMedia属性，就添加它。
if (navigator.mediaDevices.getUserMedia === undefined) {
navigator.mediaDevices.getUserMedia = function (constraints) {
// 首先获取现存的getUserMedia(如果存在)
var getUserMedia = navigator.webkitGetUserMedia || navigator.mozGetUserMedia;
// 有些浏览器不支持，会返回错误信息
// 保持接口一致
if (!getUserMedia) {
return Promise.reject(new Error('getUserMedia is not implemented in this browser'));
}
//否则，使用Promise将调用包装到旧的navigator.getUserMedia
return new Promise(function (resolve, reject) {
getUserMedia.call(navigator, constraints, resolve, reject);
});
}
}
var constraints = { audio: false, video: {width: 720,height:720} }
navigator.mediaDevices.getUserMedia(constraints)
.then(function (stream) {
var video = document.querySelector('video');
// 旧的浏览器可能没有srcObject
if ("srcObject" in video) {
video.srcObject = stream;
} else {
//避免在新的浏览器中使用它，因为它正在被弃用。
video.src = window.URL.createObjectURL(stream);
}
video.onloadedmetadata = function (e) {
video.play();
};
})
.catch(function (err) {
console.log(err.name + ": " + err.message);
});
pzBtn.addEventListener("click", function () {
// 点击，canvas画图
context.drawImage(video, 0, 0, 300, 300);
// 获取图片base64链接
var image = canvas.toDataURL('image/png');
// 定义一个img
var img = new Image();
//设置属性和src
img.id = "imgBoxxx";
img.src = image;
//将图片添加到页面中
document.body.appendChild(img);
// base64转文件
function dataURLtoFile(dataurl, filename) {
var arr = dataurl.split(','), mime = arr[0].match(/:(.*?);/)[1],
bstr = atob(arr[1]), n = bstr.length, u8arr = new Uint8Array(n);
while (n--) {
u8arr[n] = bstr.charCodeAt(n);
}
return new File([u8arr], filename, {type: mime});
}
console.log(dataURLtoFile(image, 'aa.png'));
});
</script>
</body>
</html>
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