llqrcode.js具备扫描二维码性能，用来进行从图片中辨认二维码，可解析二维码的信息。
代码
<!DOCTYPE html><html><head> <meta charset="UTF-8"> <title>llqrcode辨认二维码</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 ="辨认内容："+ 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>抉择一张二维码图片</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> <!-- 辨认后果 --> <p id="qrcodeUrl"></p> <a href="" id="rescan">从新辨认</a></body></html>llqrcode.js下载：https://likeyun.lanzout.com/i...