consumer-coupon/js/scan.js

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")
}
}
}