需求：vue項目要求要在瀏覽器中調用攝像頭進行掃一掃，並識別出二維碼的字符串
插件：QRCodeReader
插件下載
npm install --save vue-qrcode-reader
注意： 需要在https協議下才可以調用相機，實現掃碼。 可以通過配置vue.config.js中的devServer:{https:true}
場景：點擊掃一掃的圖標，觸發掃一掃功能，自動識別出數據之后，enter回車鍵觸發接口請求
在需要用到這個組件的父頁面
template(vue, elementui, pug格式)
el-input(placeholder="手機號/訂單號" v-model="result" class="preview-input" @keyup.enter.native="getOrderinfo()") i(slot="suffix" class="el-icon-full-screen" @click="clickCode()") img(slot="prefix" src="@/assets/img/search.svg" class="input-img" @click="getOrderinfo()") div(class="notes") BarScan(v-bind:scancode="scancode" v-if="scancode" @ok="getResult" )
引入子組件
import BarScan from '../../components/common/scan.vue';
使用到的data
data: () => ({
scancode:false,//控制是否使用掃一掃功能
result: '',//掃碼結果信息
}),
組件注冊
components: { BarScan },
該頁面觸發到的方法
methods: {
// 打開相機
clickCode() {
this.scancode=true;
},
//返回掃描結果並關閉攝像頭
getResult(result){
this.result=result;
if(result!==""){
this.scancode=false;
}
},
//識別完文本之后，enter觸發接口請求
getOrderinfo()
}
},
掃一掃組件頁面
scan.vue
<template>
<div class="scan" v-if="scancode">
<qrcode-stream @decode="onDecode" @init="onInit" style="height: 100vh;">
<div>
<div class="qr-scanner">
<div class="box">
<div class="line"></div>
<div class="angle"></div>
</div>
</div>
</div>
</qrcode-stream>
</div>
</template>
<script>
// 下載插件
// cnpm install --save vue-qrcode-reader
// 引入
import { QrcodeStream } from 'vue-qrcode-reader'
export default {
// 注冊
components: { QrcodeStream },
props: {
scancode: {
type: Boolean,
default: false,
}
},
data() {
return {
result: '', // 掃碼結果信息
error: '' // 錯誤信息
}
},
created(){
this.clickCode()
},
methods: {
clickCode() {
this.scancode=true;
},
//回調掃描結果
onDecode (result) {
if(result!==""){
this.scancode=false;
this.$emit("ok",result)
}
},
// 檢查是否調用攝像頭
async onInit (promise) {
try {
await promise
} catch (error) {
if (error.name === 'NotAllowedError') {
this.error = "ERROR: 您需要授予相機訪問權限"
} else if (error.name === 'NotFoundError') {
this.error = "ERROR: 這個設備上沒有攝像頭"
} else if (error.name === 'NotSupportedError') {
this.error = "ERROR: 所需的安全上下文(HTTPS、本地主機)"
} else if (error.name === 'NotReadableError') {
this.error = "ERROR: 相機被占用"
} else if (error.name === 'OverconstrainedError') {
this.error = "ERROR: 安裝攝像頭不合適"
} else if (error.name === 'StreamApiNotSupportedError') {
this.error = "ERROR: 此瀏覽器不支持流API"
}
}
},
}
}
</script>
<style scoped>
.error {
font-weight: bold;
color: red;
}
</style>
<style scoped>
@import '../../assets/css/scancode.scss';
</style>
引入的css
scancode.scss
.scan{
width: 100vw;
border-color: #585858;
position: fixed;
top: 0;
left: 0;
}
.qrcode-stream-camera{
width: 100%;
height: 100%;
display: block;
-o-object-fit: cover;
object-fit: cover;
position: absolute;
top: 0%;
left: 0%;
}
.qr-scanner {
background-image:
linear-gradient(0deg,
transparent 24%,
rgba(32, 255, 77, 0.1) 25%,
rgba(32, 255, 77, 0.1) 26%,
transparent 27%,
transparent 74%,
rgba(32, 255, 77, 0.1) 75%,
rgba(32, 255, 77, 0.1) 76%,
transparent 77%,
transparent),
linear-gradient(90deg,
transparent 24%,
rgba(32, 255, 77, 0.1) 25%,
rgba(32, 255, 77, 0.1) 26%,
transparent 27%,
transparent 74%,
rgba(32, 255, 77, 0.1) 75%,
rgba(32, 255, 77, 0.1) 76%,
transparent 77%,
transparent);
background-size: 3rem 3rem;
background-position: -1rem -1rem;
width: 100%;
/* height: 100%; */
height: 100vh;
position: relative;
background-color: #1110;
/* background-color: #111; */
}
.qr-scanner .box {
width: 213px;
height: 213px;
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
overflow: hidden;
border: 0.1rem solid rgba(0, 255, 51, 0.2);
/* background: url('http://resource.beige.world/imgs/gongconghao.png') no-repeat center center; */
}
.qr-scanner .line {
height: calc(100% - 2px);
width: 100%;
background: linear-gradient(180deg, rgba(0, 255, 51, 0) 43%, #00ff33 211%);
border-bottom: 3px solid #00ff33;
transform: translateY(-100%);
animation: radar-beam 2s infinite alternate;
animation-timing-function: cubic-bezier(0.53, 0, 0.43, 0.99);
animation-delay: 1.4s;
}
.qr-scanner .box:after,
.qr-scanner .box:before,
.qr-scanner .angle:after,
.qr-scanner .angle:before {
content: '';
display: block;
position: absolute;
width: 3vw;
height: 3vw;
border: 0.2rem solid transparent;
}
.qr-scanner .box:after,
.qr-scanner .box:before {
top: 0;
border-top-color: #00ff33;
}
.qr-scanner .angle:after,
.qr-scanner .angle:before {
bottom: 0;
border-bottom-color: #00ff33;
}
.qr-scanner .box:before,
.qr-scanner .angle:before {
left: 0;
border-left-color: #00ff33;
}
.qr-scanner .box:after,
.qr-scanner .angle:after {
right: 0;
border-right-color: #00ff33;
}
@keyframes radar-beam {
0% {
transform: translateY(-100%);
}
100% {
transform: translateY(0);
}
}