html调用摄像头ios,html5调用摄像头
HTML代码:Snap PhotoJS代码打开摄像头var aVideo=document.getElementById('video');var aCanvas=document.getElementById('canvas');var ctx=aCanvas.getContext('2d');navigator.getUserMedia = navigator.getUserMedia ||n
HTML代码:
Snap Photo
JS代码打开摄像头
var aVideo=document.getElementById('video');
var aCanvas=document.getElementById('canvas');
var ctx=aCanvas.getContext('2d');
navigator.getUserMedia = navigator.getUserMedia ||
navigator.webkitGetUserMedia ||
navigator.mozGetUserMedia ||
navigator.msGetUserMedia;//获取媒体对象(这里指摄像头)
navigator.getUserMedia({video:true}, gotStream, noStream);//参数1获取用户打开权限;参数二成功打开后调用,并传一个视频流对象,参数三打开失败后调用,传错误信息
function gotStream(stream) {
video.src = URL.createObjectURL(stream);
video.onerror = function () {
stream.stop();
};
stream.onended = noStream;
video.onloadedmetadata = function () {
alert('摄像头成功打开!');
};
}
function noStream(err) {
alert(err);
}
按钮模拟拍照
document.getElementById("snap").addEventListener("click", function() {
ctx.drawImage(aVideo, 0, 0, 640, 480);//将获取视频绘制在画布上
});
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