<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Image QR code recognition</title>
<script src="https://cdn.bootcss.com/jquery /3.4.1/jquery.min.js"></script>
<script src="https://cozmo.github.io/jsQR/jsQR.js"></script>
</head>
<body>
< span lan_id="bc">Select picture</span> <input type="file" id="pictureChange"/> <div> <h2>
Recognition
result:</h2>
<ul id="result">
</ ul>
</div>
</body>
<script type="text/javascript">
$("body").append('<canvas id="qrcanvas" style="display:none;"></canvas>')
$("#pictureChange").change(function (e) {
var file = e.target.files[0];
if(window.FileReader) {
var fr = new FileReader();
fr.readAsDataURL(file);
fr.onloadend = function(e) {
var base64Data = e.target.result;
base64ToqR(base64Data)
}
}
})
function base64ToqR(data) {
var c = document.getElementById("qrcanvas");
var ctx = c.getContext("2d");
var img = new Image();
img.src = data;
img.onload = function() {
$("#qrcanvas").attr("width",img.width)
$("#qrcanvas").attr("height",img.height)
ctx.drawImage(img, 0, 0, img.width, img.height);
var imageData = ctx.getImageData(0, 0, img.width, img.height);
const code = jsQR(imageData.data, imageData.width, imageData.height, {
inversionAttempts: "dontInvert",
});
if(code){
showCode(code.data)
}else{
alert("识别错误")
}
};
}
function showCode(code){
$("#result").append("<li>"+code+"</li>")
}
</script>
</html>
Native js\h5 recognize QR code
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Origin blog.csdn.net/qq_43314341/article/details/128202247
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