如何使用h5-scan-qrcode插件实现一个h5页面扫码识别二维码功能
jsQR.js ----是这个插件所用的一个js可以在vue文件里面直接拿出来 可以去官网看看（不想动手的 麻烦踢踢后台的我 给你们私发！scancode ---- html文件 如何引入js。我做的比这个效果多一个拿取本地图库的二维码扫码。scancode.js---- 封装的js文件。jquery.js ----这就不用说了吧。这个是效果 可以提前看一下~
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为了适应公司代码全程使用jquery构造 如需其他js或者vue 可根据此代码去改（因为好多地方会用到这个东西所以我封装成了一个js文件）
研究了第二期 实现条形码的识别和上传图片识别 通过type切换 识别二维码还是条形码
欢迎大家多多观看 多多支持👇下
点这进入看
👆
https://dragonir.github.io/h5-scan-qrcode/#/
这个是效果 可以提前看一下~
我做的比这个效果多一个拿取本地图库的二维码扫码
scancode ---- html文件 如何引入js
scancode.js---- 封装的js文件
jsQR.js ---- 是这个插件所用的一个js可以在vue文件里面直接拿出来 可以去官网看看（不想动手的 麻烦踢踢后台的我 给你们私发！）
jquery.js ----这就不用说了吧
如果想要整个流程 后台踢我私信邮箱或者联系方式 (谢谢理解！)
scancode.html
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script src="jquery-3.1.1.min.js"></script>
<script type="text/javascript" src="scancode.js?v=1"></script>
<script type="text/javascript" src="jsQR.js"></script>
</head>
<body>
<div class="">
<button id="search_scans">点击扫码</button>
<input type="text" id="assetTableSearch"> //扫码内容复现到此input上
</div>
</body>
<script>
$(function (){
scancode({btn:$('#search_scans'),input:$('#assetTableSearch')})
})
</script>
</html>
scancode.js
/*
示例：
scancode({
btn:$('#search_scans'), //打开扫码的按钮
input:$('#assetTableSearch'), //扫码内容写入的input 可选
callback:function(code){ //扫码成功回调 可选
console.log(code)
}
})
*/
(function(global){
global.scancode = function(opt){
return new ScanCode(opt);
}
function ScanCode(opt){
this.init(opt);
}
ScanCode.prototype = {
constructor: ScanCode,
//扫码识别将内容展示到输入框内 opt是对象 btn:按钮名称 input:输入框 callback:返回数据
init: function(opt){
this.opt = opt
this.addDom() //添加dom元素
this.addCss() //添加class元素
this.addEvent() //添加事件
this.closeScan() //初始化关闭事件
this.addLocalGallery() //调取本地图库
},
addLocalGallery:function (){
$('#scan_bendi_pic').on('click',function (){
$('#scan_bendi').click()
})
},
addDom:function (){
if($('#scan_code_scaner').length === 0){
var html = '<div id="scan_code_scaner">'
+'<i id="scan_code_close_icon"></i>'
+'<div id="scan_code_banner"><p >若当前浏览器无法扫码，请切换其他浏览器尝试</p></div>'
+'<div class="scan_code_cover">\n' +
' <p class="scan_code_line"></p>\n' +
' <span class="scan_code_square_top_left"></span>\n' +
' <span class="scan_code_square_top_right"></span>\n' +
' <span class="scan_code_square_bottom_right"></span>\n' +
' <span class="scan_code_square_bottom_left"></span>\n' +
' <p class="scan_code_tips">将二维码放入框内，即可自动扫描</p>\n' +
' </div>'
+' <video\n' +
' id="scan_code_video"\n' +
' width="100%"\n' +
' height="100%"\n' +
' controls\n' +
' ></video>'
+'<canvas id="scan_code_canvas"/>'
+'<div id="scan_bendi_pic"></div>' //如果不想扫码 可点击图库 扫图库里面的二维码
+'<input type="file" id="scan_bendi" ></input>'
+'</div>'
$('body').append(html);
}
},
addCss:function (){
if($('.scan-code-css').length===0){
var css = '<style class="scan-code-css">'
+'#scan_code_scaner{display: none;background: #000000;position: fixed;top: 0;left: 0; width: 100%;height: 100%;}'
+'#scan_code_scaner #scan_code_banner{ width: 340px;position: absolute;top: 10%; left: 50%;margin-left: -170px;background: #FA74A2;border-radius: 8px;box-sizing: border-box;padding: 12px;opacity: 0.9;box-shadow: 1px 1px 10px rgba(0, 0, 0, 0.2);}'
+'#scan_code_scaner #scan_code_banner p{ padding: 0;\n' +
' margin: 0;\n' +
' color: #FFFFFF;\n' +
' font-size: 12px;\n' +
' text-align: justify;\n' +
' text-align-last: left;}'
+'#scan_code_close_icon{display: inline-block;\n' +
' height: 24px;\n' +
' width: 24px;\n' +
' background: url("data:image/svg+xml;charset=utf-8,%3Csvg t=\'1678697006161\' class=\'icon\' viewBox=\'0 0 1024 1024\' version=\'1.1\' xmlns=\'http://www.w3.org/2000/svg\' p-id=\'14211\' xmlns:xlink=\'http://www.w3.org/1999/xlink\' width=\'16\' height=\'16\'%3E%3Cpath d=\'M512 66.4c-244.6 0-444.8 200.2-444.8 444.8S267.4 956 512 956s444.8-200.2 444.8-444.8S756.6 66.4 512 66.4z m0 815.5c-207.6 0-370.7-163.1-370.7-370.7S304.4 140.5 512 140.5s370.7 163.1 370.7 370.7S719.6 881.9 512 881.9z\' fill=\'%23ffffff\' p-id=\'14212\'%3E%3C/path%3E%3Cpath d=\'M636.6 695.4L335.3 394.2c-13.8-13.8-13.8-36.5 0-50.3l1.1-1.1c13.8-13.8 36.5-13.8 50.3 0L688 644c13.8 13.8 13.8 36.5 0 50.3l-1.1 1.1c-13.9 13.9-36.5 13.9-50.3 0z\' fill=\'%23ffffff\' p-id=\'14213\'%3E%3C/path%3E%3Cpath d=\'M333 644.2l301.3-301.3c13.8-13.8 36.5-13.8 50.3 0l1.1 1.1c13.8 13.8 13.8 36.5 0 50.3L384.4 695.6c-13.8 13.8-36.5 13.8-50.3 0l-1.1-1.1c-13.8-13.8-13.8-36.4 0-50.3z\' fill=\'%23ffffff\' p-id=\'14214\'%3E%3C/path%3E%3C/svg%3E") no-repeat center;\n' +
' background-size: auto 100%;\n' +
' position: absolute;\n' +
' right: 10px;\n' +
' top: 15px;}'
+'#scan_code_scaner .scan_code_cover{height: 220px;\n' +
' width: 220px;\n' +
' position: absolute;\n' +
' top:50%;\n' +
' left:50%;\n' +
' -webkit-transform: translate(-50%,-50%);\n' +
' -moz-transform: translate(-50%,-50%);\n' +
' -ms-transform: translate(-50%,-50%);\n' +
' -o-transform: translate(-50%,-50%);\n' +
' transform: translate(-50%,-50%);\n' +
' border: .5px solid #999999;\n' +
' z-index: 1111;}'
+'#scan_code_scaner .scan_code_cover .scan_code_line{ width: 200px;\n' +
' height: 1px;\n' +
' margin-left: 10px;\n' +
' background: #5F68E8;\n' +
' background: linear-gradient(to right, transparent, #5F68E8, #0165FF, #5F68E8, transparent);\n' +
' position: absolute;\n' +
' -webkit-animation: scan 1.75s infinite linear;\n' +
' -moz-animation: scan 1.75s infinite linear;\n' +
' -ms-animation: scan 1.75s infinite linear;\n' +
' -o-animation: scan 1.75s infinite linear;\n' +
' animation: scan 1.75s infinite linear;\n' +
' -webkit-animation-fill-mode: both;\n' +
' -moz-animation-fill-mode: both;\n' +
' -ms-animation-fill-mode: both;\n' +
' -o-animation-fill-mode: both;\n' +
' animation-fill-mode: both;\n' +
' border-radius: 1px;}'
+'#scan_code_scaner .scan_code_cover .scan_code_square_top_left{display: inline-block;\n' +
' height: 20px;\n' +
' width: 20px;\n' +
' position: absolute;\n' +
' top: 0;\n' +
' left: 0;\n' +
' border-left: 1px solid #5F68E8;\n' +
' border-top: 1px solid #5F68E8;}'
+'#scan_code_scaner .scan_code_cover .scan_code_square_top_right{display: inline-block;\n' +
' height: 20px;\n' +
' width: 20px;\n' +
' position: absolute;\n' +
' top: 0;\n' +
' right: 0;\n' +
' border-right: 1px solid #5F68E8;\n' +
' border-top: 1px solid #5F68E8;}'
+'#scan_code_scaner .scan_code_cover .scan_code_square_bottom_right{display: inline-block;\n' +
' height: 20px;\n' +
' width: 20px;\n' +
' position: absolute;\n' +
' bottom: 0;\n' +
' right: 0;\n' +
' border-right: 1px solid #5F68E8;\n' +
' border-bottom: 1px solid #5F68E8;}'
+'#scan_code_scaner .scan_code_cover .scan_code_square_bottom_left{display: inline-block;\n' +
' height: 20px;\n' +
' width: 20px;\n' +
' position: absolute;\n' +
' bottom: 0;\n' +
' left: 0;\n' +
' border-left: 1px solid #5F68E8;\n' +
' border-bottom: 1px solid #5F68E8;}'
+'#scan_code_scaner .scan_code_cover .scan_code_tips{' +
'position: absolute;\n' +
' bottom: -48px;\n' +
' width: 100%;\n' +
' font-size: 14px;\n' +
' color: #FFFFFF;\n' +
' opacity: 0.8;}'
+'#scan_code_video{display: none;}'
+'@-webkit-keyframes scan{0% {top: 0}\n' +
' 25% {top: 50px}\n' +
' 50% {top: 100px}\n' +
' 75% {top: 150px}\n' +
' 100% {top: 200px}}'
+'@-moz-keyframes scan{ 0% {top: 0}\n' +
' 25% {top: 50px}\n' +
' 50% {top: 100px}\n' +
' 75% {top: 150px}\n' +
' 100% {top: 200px}}'
+'@-o-keyframes scan{0% {top: 0}\n' +
' 25% {top: 50px}\n' +
' 50% {top: 100px}\n' +
' 75% {top: 150px}\n' +
' 100% {top: 200px}}'
+'@keyframes scan{0% {top: 0}\n' +
' 25% {top: 50px}\n' +
' 50% {top: 100px}\n' +
' 75% {top: 150px}\n' +
' 100% {top: 200px}}'
+'#scan_bendi_pic{' +
' background: url("data:image/svg+xml;charset=utf-8,%3Csvg t=\'1678781826211\' class=\'icon\' viewBox=\'0 0 1024 1024\' version=\'1.1\' xmlns=\'http://www.w3.org/2000/svg\' p-id=\'33273\' xmlns:xlink=\'http://www.w3.org/1999/xlink\' width=\'16\' height=\'16\'%3E%3Cpath d=\'M307.0194 136.051734c-56.587889 0-102.3398 45.751911-102.3398 102.3398 0 56.587889 45.751911 102.3398 102.3398 102.3398 56.587889 0 102.3398-45.751911 102.3398-102.3398C409.3592 181.803645 363.60729 136.051734 307.0194 136.051734zM307.0194 272.103469c-18.661964 0-34.313933-15.049971-34.313933-34.313933 0-18.661964 15.049971-34.313933 34.313933-34.313933 18.661964 0 34.313933 15.049971 34.313933 34.313933C341.333333 257.053498 326.283363 272.103469 307.0194 272.103469z\' p-id=\'33274\' fill=\'%23ffffff\'%3E%3C/path%3E%3Cpath d=\'M705.542622 567.684891l-127.021752 125.215755c0 0-0.601999 0-0.601999 0.601999-10.23398 10.23398-10.23398 25.885949 0 36.119929 10.23398 10.23398 25.885949 10.23398 36.119929 0 0.601999-0.601999 0.601999-1.805996 1.805996-2.407995l76.453851-76.453851 36.119929-36.119929c0 0 24.681952 23.477954 25.283951 22.875955 9.631981 4.213992 21.069959 3.009994 28.895944-4.815991 10.23398-10.23398 10.23398-25.885949 0-36.119929l-18.059965-18.059965c0 0-3.611993-3.611993-5.417989-5.417989C744.672546 558.05291 722.398589 556.246914 705.542622 567.684891z\' p-id=\'33275\' fill=\'%23ffffff\'%3E%3C/path%3E%3Cpath d=\'M807.882422 693.502646l11.437978 11.437978c10.23398 10.23398 25.885949 10.23398 36.119929 0 10.23398-10.23398 10.23398-25.885949 0-36.119929l-11.437978-11.437978 0 0c0 0 0-0.601999-0.601999-0.601999-10.23398-10.23398-25.885949-10.23398-36.119929 0C797.046443 667.014697 797.046443 683.268665 807.882422 693.502646 807.280423 693.502646 807.280423 693.502646 807.882422 693.502646z\' p-id=\'33276\' fill=\'%23ffffff\'%3E%3C/path%3E%3Cpath d=\'M951.158142 92.10582l-0.601999 0.601999c-3.009994 6.019988-4.213992 12.039976-3.611993 18.661964 4.213992 55.383892 7.223986 348.557319 7.825985 468.957084 0 18.059965-22.273956 27.089947-34.915932 13.845973l-146.887713-157.723692c-6.621987-15.049971-21.671958-25.885949-39.129924-25.885949-15.651969 0-29.497942 8.427984-36.721928 21.069959l-249.227513 249.227513c-7.223986 5.417989-7.223986 5.417989-15.049971 0L291.367431 565.276896c-7.825985-10.23398-19.865961-17.457966-34.313933-17.457966-7.223986 0-13.845973 1.805996-19.865961 4.815991l-6.621987 4.213992c-2.407995 1.805996-4.213992 3.611993-6.019988 5.417989l-157.121693 150.499706L67.423868 136.653733c0-37.925926 30.70194-68.025867 68.025867-68.025867 0 0 627.282775 1.203998 754.304527 4.213992 13.845973 0 25.885949-7.223986 32.507937-19.865961l0.601999-0.601999c11.437978-22.875955-4.213992-50.567901-29.497942-51.771899-1.805996 0-4.213992 0-6.019988 0L136.653733 0.601999C61.40388 0 0 60.801881 0 136.653733l0 750.692534c0 75.249853 61.40388 136.653733 136.653733 136.653733l750.692534 0c75.249853 0 136.653733-61.40388 136.653733-136.653733L1024 136.653733c0-13.243974-1.805996-25.885949-5.417989-37.925926C1009.552028 66.821869 966.208113 62.607878 951.158142 92.10582zM955.974133 887.346267c0 37.925926-30.70194 68.025867-68.025867 68.025867L136.653733 955.372134c-37.925926 0-68.025867-30.70194-68.025867-68.025867L68.627866 806.678424l181.803645-173.97766c6.019988-5.417989 10.23398-5.417989 16.253968 0l139.663727 114.379777c12.039976 8.427984 25.283951 18.661964 35.517931 18.661964s22.273956-3.611993 35.517931-16.855967l253.441505-253.441505c1.203998 0 2.407995 0.601999 4.213992 0.601999 0.601999 0 0.601999 0 1.203998 0l220.33157 236.585538L956.576132 887.346267z\' p-id=\'33277\' fill=\'%23ffffff\'%3E%3C/path%3E%3C/svg%3E");\n' +
' background-size: auto 100%;\n' +
'position: absolute;\n' +
'width: 20px;\n' +
'height: 20px;'+
'bottom: 15px;\n' +
'left: 15px;}'+
'#scan_bendi{' +
'position: absolute;\n' +
' left: -2000px;\n' +
' bottom: 0px;}'
+'</style>';
$('body').append(css);
}
},
addEvent:function (){
var obj = {};
this.obj = obj
var _this = this;
this.opt.btn.on('click',function (){
$('#scan_code_scaner').show()
// 判断了浏览器是否支持挂载在MediaDevices.getUserMedia()的方法
if (navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
obj.lineColor='#03C03C';
obj.code = '';
obj.lineWidth = 2;
obj.previousCode = null;
obj.drawOnfound = true;
obj.parity = 0;
obj.active = true;
obj.useBackCamera = true
obj.canvas = document.getElementById('scan_code_canvas')
obj.scan_code_video = document.getElementById('scan_code_video')
obj.canvas_getContext = document.getElementById('scan_code_canvas').getContext("2d");
// 获取摄像头模式，默认设置是后置摄像头
const facingMode = obj.useBackCamera ? { exact: 'environment' } : 'user';
// 摄像头视频处理
const handleSuccess = stream => {
if (obj.scan_code_video.srcObject !== undefined) {
obj.scan_code_video.srcObject = stream;
} else if (window.videoEl && window.videoEl.mozSrcObject !== undefined) {
obj.scan_code_video.mozSrcObject = stream;
} else if (window.URL && window.URL.createObjectURL) {
obj.scan_code_video.src = window.URL.createObjectURL(stream);
} else if (window.webkitURL) {
obj.scan_code_video.src = window.webkitURL.createObjectURL(stream);
} else {
obj.scan_code_video.src = stream;
}
// 不希望用户来拖动进度条的话，可以直接使用playsinline属性，webkit-playsinline属性
obj.scan_code_video.playsInline = true;
var playPromise = obj.scan_code_video.play();
playPromise.catch(() => {
$('#scan_code_video').show()
$('#scan_code_canvas').hide()
});
// 视频开始播放时进行周期性扫码识别
playPromise.then(()=>{
_this.run()
});
};
// 捕获视频流
navigator.mediaDevices
.getUserMedia({ video: { facingMode } })
.then(handleSuccess)
.catch(() => {
navigator.mediaDevices
.getUserMedia({ video: true })
.then(handleSuccess)
.catch(error => {
console.log(error)
});
});
}
})
$('#scan_bendi').on('change',function (event){
var docObj = document.getElementById("scan_bendi");
console.log(44444,docObj.files[0])
var URL = window.URL || window.webkitURL; // 兼容
var img = new Image(); // 创建图片对象
img.src = URL.createObjectURL(docObj.files[0]);//创建Image的对象的url
img.onload = function () {
// console.log(22222222,'height:'+this.height+'----width:'+this.width)
_this.obj.canvas.width = this.width;
_this.obj.canvas.height =this.height;
URL.revokeObjectURL(img.src);
_this.obj.canvas_getContext.drawImage(img, 0, 0, this.width, this.height)
var imageData = _this.obj.canvas_getContext.getImageData( 0, 0, this.width, this.height)
var code = jsQR(imageData.data, imageData.width, imageData.height);
console.log("Found QR code", code);
if(code.data){
obj.code = code.data
if(_this.opt.input){
$(_this.opt.input).val(obj.code)
}
if(_this.opt.callback){
_this.opt.callback(code)
}
$('#scan_code_scaner').hide()
_this.obj.scan_code_video.srcObject.getTracks().forEach(t => t.stop());
}
}
})
},
closeScan:function (){
$(document).on('click','#scan_code_close_icon',function (){
$('#scan_code_scaner').hide()
})
},
drawLine:function (begin, end){
var obj = this.obj
obj.canvas_getContext.beginPath();
obj.canvas_getContext.moveTo(begin.x, begin.y);
obj.canvas_getContext.lineTo(end.x, end.y);
obj.canvas_getContext.lineWidth = obj.lineWidth;
obj.canvas_getContext.strokeStyle = obj.lineColor;
obj.canvas_getContext.stroke();
},
run:function() {
var obj = this.obj
if (obj.active) {
requestAnimationFrame(()=>{
this.tick()
})
}
},
tick:function () {
var obj = this.obj
if (obj.scan_code_video && obj.scan_code_video.readyState === obj.scan_code_video.HAVE_ENOUGH_DATA) {
obj.canvas.height = document.documentElement.clientHeight || document.body.clientHeight;
obj.canvas.width = document.documentElement.clientWidth || document.body.clientWidth;
$('#scan_code_video').attr('height',obj.canvas.height)
$('#scan_code_video').attr('width',obj.canvas.width)
obj.canvas_getContext.drawImage(obj.scan_code_video, 0, 0, obj.canvas.width, obj.canvas.height);
const imageData = obj.canvas_getContext.getImageData(0, 0, obj.canvas.width, obj.canvas.height);
var code = false;
try {
code = jsQR(imageData.data, imageData.width, imageData.height);
} catch (e) {
console.error(e);
}
if (code) {
this.drawBox(code.location);
this.found(code.data);
}
}
this.run();
},
drawBox:function (location) {
var obj = this.obj
if (obj.drawOnfound) {
this.drawLine(location.topLeftCorner, location.topRightCorner);
this.drawLine(location.topRightCorner, location.bottomRightCorner);
this.drawLine(location.bottomRightCorner, location.bottomLeftCorner);
this.drawLine(location.bottomLeftCorner, location.topLeftCorner);
}
},
found:function (code) {
var obj = this.obj
if (obj.previousCode !== code) {
obj.previousCode = code;
} else if (obj.previousCode === code) {
obj.parity += 1;
}
if (obj.parity > 2) {
obj.active = true;
obj.parity = 0;
obj.code = code
if(this.opt.input){
$(this.opt.input).val(obj.code)
}
if(this.opt.callback){
this.opt.callback(code)
}
$('#scan_code_scaner').hide()
obj.scan_code_video.srcObject.getTracks().forEach(t => t.stop());
}
},
}
})(window)
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