1.使用Quagga必须在https环境下才能测试，这里我使用github进行测试
2.设置默认后摄像头扫码 设置deviceId， Quagga.CameraAccess.enumerateVideoDevices().then(function(devices)获取deviceId
<htmllang="en">
<head>
<metacharset="UTF-8">
<metaname="viewport"content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<style>
*{
padding:0;
margin:0;
}
#cameras{
width:350px;
height:350px;
border:1pxsolid red;
overflow: hidden;
margin:50pxauto;
}
</style>
<body>
<divid="root">
<h2>实现扫码</h2>
<selectid="selected" v-model="deviceId" @change="handleSelect">
<optionv-for="item in devices":key="item.deviceId":value="item.deviceId">{{item.deviceId}}</option>
</select>
<divid="cameras"></div>
</div>
<scriptsrc="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<scriptsrc="./quagga.js"></script>
<script>
newVue({
el:document.getElementById('root'),
data:{
deviceId:'',
devices:[]
},
mounted(){
this.onlyOne=true
this.initCameraSelection()
},
methods:{
init(){
const self=this;
Quagga.init(this.states(),function(err){
if(err){
console.log(err);
}
Quagga.start();
});
},
states(){
return{
inputStream:{
type:"LiveStream",
target:document.getElementById('cameras'),
constraints:{
width:{min:350},
height:{min:350},
facingMode:"environment",
deviceId:this.deviceId,
aspectRatio:{min:1,max:2}
}
},
locator:{
patchSize:"medium",
debug:{
showCanvas:false,
showPatches:false,
showFoundPatches:false,
showSkeleton:false,
showLabels:false,
showPatchLabels:false,
showRemainingPatchLabels:false,
boxFromPatches:{
showTransformed:false,
showTransformedBox:false,
showBB:false
}
},
halfSample:true
},
numOfWorkers:1,
multiple:false,
frequency:10,
decoder:{
readers:[{
format:"code_93_reader",
config:{}
}]
},
locate:true
}
},
handleSelect(){
this.init()
},
initCameraSelection(){
const self=this
returnQuagga.CameraAccess.enumerateVideoDevices()
.then(function(devices){
self.deviceId=devices[1].deviceId
self.devices=devices
self.init()
Quagga.onDetected(function(data){
varcode=data.codeResult.code;
Quagga.stop()
});
});
}
}
})
</script>
</body>
</html>
效果：
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