92 lines
1.8 KiB
JavaScript
92 lines
1.8 KiB
JavaScript
|
//是否成功调用getUserMedia标识
|
||
|
|
var gUM = false;
|
||
|
|
|
||
|
|
//画布getContext对象
|
||
|
|
var gCtx = null;
|
||
|
|
|
||
|
|
// 数据流对象
|
||
|
|
var imageData = null;
|
||
|
|
|
||
|
|
//视频展示对象
|
||
|
|
var v = document.getElementById("v");
|
||
|
|
var n = navigator;
|
||
|
|
|
||
|
|
// 画布元素
|
||
|
|
var gCanvas = document.getElementById("qr-canvas");
|
||
|
|
gCtx = gCanvas.getContext('2d');
|
||
|
|
qrcode.callback = function(e) {
|
||
|
|
//结果回调
|
||
|
|
alert(e);
|
||
|
|
}
|
||
|
|
|
||
|
|
//不同getUserMedia处理
|
||
|
|
if (n.getUserMedia) {
|
||
|
|
// 移动设备打开后置摄像头【 facingMode: "environment"】
|
||
|
|
n.getUserMedia({
|
||
|
|
video: {
|
||
|
|
facingMode: "environment"
|
||
|
|
}
|
||
|
|
}, success, error);
|
||
|
|
} else if (n.mediaDevices.getUserMedia) {
|
||
|
|
n.mediaDevices.getUserMedia({
|
||
|
|
video: {
|
||
|
|
facingMode: "environment"
|
||
|
|
},
|
||
|
|
audio: false
|
||
|
|
})
|
||
|
|
.then(success)
|
||
|
|
.catch(error);
|
||
|
|
} else if (n.webkitGetUserMedia) {
|
||
|
|
webkit = true;
|
||
|
|
n.webkitGetUserMedia({
|
||
|
|
video: {
|
||
|
|
facingMode: "environment"
|
||
|
|
}
|
||
|
|
}, success, error);
|
||
|
|
} else if (n.mozGetUserMedia) {
|
||
|
|
moz = true;
|
||
|
|
n.mozGetUserMedia({
|
||
|
|
video: {
|
||
|
|
facingMode: "environment"
|
||
|
|
}
|
||
|
|
}, success, error);
|
||
|
|
}
|
||
|
|
|
||
|
|
//getUserMedia调用成功
|
||
|
|
function success(stream) {
|
||
|
|
v = document.getElementById("v");
|
||
|
|
try {
|
||
|
|
v.srcObject = stream;
|
||
|
|
} catch {
|
||
|
|
//这里是兼容写法
|
||
|
|
let compatibleURL = window.URL || window.webkitURL;
|
||
|
|
v.src = compatibleURL.createObjectURL(stream);
|
||
|
|
}
|
||
|
|
gUM = true;
|
||
|
|
setTimeout(captureToCanvas, 500);
|
||
|
|
}
|
||
|
|
|
||
|
|
//getUserMedia调用失败
|
||
|
|
function error(error) {
|
||
|
|
alert(error)
|
||
|
|
gUM = false;
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
//将视频流放到画布
|
||
|
|
function captureToCanvas() {
|
||
|
|
if (gUM) {
|
||
|
|
gCtx.drawImage(v, 0, 0);
|
||
|
|
setTimeout(captureToCanvas, 500);
|
||
|
|
imageData = gCtx.getImageData(0, 0, 600, 600);
|
||
|
|
const code = jsQR(imageData.data, imageData.width, imageData.height, {
|
||
|
|
inversionAttempts: "dontInvert",
|
||
|
|
});
|
||
|
|
alert('code.data:' + code.data);
|
||
|
|
if (code) {
|
||
|
|
window.location.href = code.data;
|
||
|
|
} else {
|
||
|
|
alert("识别错误")
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|