llqrcode.js has the function of scanning QR codes, which is used to identify QR codes from pictures and analyze the information of QR codes.
directly on the code
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>llqrcode识别二维码</title>
<script src="llqrcode.js"></script>
<script>
function getUrl(e,param){
analyticCode.getUrl(
param,e,function(url,param){
document.querySelector("#uploadQrcode").style.display = "none";
document.querySelector("#uploadQrcode_preview").innerHTML ="<img src='"+param+"' />";
document.querySelector("#qrcodeUrl").innerHTML ="识别内容："+ url;
document.querySelector("#rescan").style.display = "block";
}
)
}
let getObjectURL = function(file){
let url = null ;
if (window.createObjectURL!=undefined) {
url = window.createObjectURL(file) ;
} else if (window.URL!=undefined) {
url = window.URL.createObjectURL(file) ;
} else if (window.webkitURL!=undefined) {
url = window.webkitURL.createObjectURL(file) ;
}
return url ;
}
window.analyticCode = {
getUrl : function(type,elem,fn){
let url = null,src = null;
if(type === 'img-url'){
url = elem.src;
}else if(type === 'file-url' && elem.files.length > 0){
url = getObjectURL(elem.files[0]);
}
qrcode.decode(url);
qrcode.callback = function(imgMsg){
fn(imgMsg,url);
}
}
}
</script>
<style>
h3{
text-align: center;
margin-top: 100px;
}
#uploadQrcode{
width: 80px;
height: 80px;
margin:20px auto 0;
border: 2px dashed #ccc;
border-radius: 20px;
font-size: 25px;
line-height: 80px;
text-align: center;
color: #ccc;
position: relative;
cursor: pointer;
}
#selectQrcode{
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
opacity: 0;
cursor: pointer;
}
#qrcodeUrl{
text-align: center;
margin-top: 15px;
}
#uploadQrcode_preview{
width: 80px;
height: 80px;
margin:20px auto 0;
}
#uploadQrcode_preview img{
width: 80px;
height: 80px;
}
#rescan{
text-align: center;
text-decoration: none;
color: #666;
font-size: 15px;
margin-top: 15px;
display: none;
}
</style>
</head>
<body>
<h3>选择一张二维码图片</h3>
<div id="uploadQrcode">
<span>+</span>
<input type="file" id="selectQrcode" onChange="getUrl(this,'file-url')" />
</div>
<!-- 图片预览 -->
<div id="uploadQrcode_preview"></div>
<!-- 识别结果 -->
<p id="qrcodeUrl"></p>
<a href="" id="rescan">重新识别</a>
</body>
</html>Author: TANKING
llqrcode.js download:
llqrcode.js recognizes QR codes and parses QR code information Develop Paper