需求：vue项目要求要在浏览器中调用摄像头进行扫一扫，并识别出二维码的字符串
插件：QRCodeReader
插件下载
npm install --save vue-qrcode-reader
注意： 需要在https协议下才可以调用相机，实现扫码。 可以通过配置vue.config.js中的devServer:{https:true}。说错了，是在：build/webpack.dev.conf.js里面
这步骤可省略：解决http下访问摄像头可见我下篇文章：https://www.cnblogs.com/Fancy1486450630/p/15719466.html
场景：点击扫一扫的图标，触发扫一扫功能，自动识别出数据之后，触发接口请求
公共组件页面（子页面）：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>
// 下载插件
// cnpm install --save vue-qrcode-reader
// 引入
import {
QrcodeStream
} from 'vue-qrcode-reader'
export default {
// 注册
components: {
QrcodeStream
},
props: {
scancode: {
type: Boolean,
default: false,
}
},
data() {
return {
result: '', // 扫码结果信息
error: '' // 错误信息
}
},
created() {
this.clickCode()
},
methods: {
clickCode() {
this.scancode = true;
},
//回调扫描结果
onDecode(result) {
if (result !== "") {
this.scancode = false;
this.$emit("ok", result)
}
},
// 检查是否调用摄像头
async onInit(promise) {
try {
await promise
} catch (error) {
if (error.name === 'NotAllowedError') {
this.error = "ERROR: 您需要授予相机访问权限"
} else if (error.name === 'NotFoundError') {
this.error = "ERROR: 这个设备上没有摄像头"
} else if (error.name === 'NotSupportedError') {
this.error = "ERROR: 所需的安全上下文(HTTPS、本地主机)"
} else if (error.name === 'NotReadableError') {
this.error = "ERROR: 相机被占用"
} else if (error.name === 'OverconstrainedError') {
this.error = "ERROR: 安装摄像头不合适"
} else if (error.name === 'StreamApiNotSupportedError') {
this.error = "ERROR: 此浏览器不支持流API"
}
}
},
}
}
</script>
<style scoped>
.error {
font-weight: bold;
color: red;
}
</style>
<style scoped>
.scan {
100vw;
border-color: #585858;
position: fixed;
top: 0;
left: 0;
}
.qrcode-stream-camera {
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;
100%;
/* height: 100%; */
height: 100vh;
position: relative;
background-color: #1110;
/* background-color: #111; */
}
.qr-scanner .box {
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);
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;
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);
}
}
</style>
父页面：
<div class="title">
<span @click="clickCode">扫码</span>
<scan :scancode='scancode' v-if="scancode" @ok="getResult" />
</div>
<script>
import scan from './scan.vue'
export default {
components: {
scan
},
data() {
return {
isShow: true, //页面其他文字内容隐藏
scancode: false, //控制是否使用扫一扫功能
result: '', //扫码结果信息
}
},
methods: {
// 打开相机
clickCode() {
this.isShow = false;
this.scancode = true;
},
//返回扫描结果并关闭摄像头
getResult(result) {
console.log(this.result)
this.result = result;
if (result !== "") {
this.$emit("result", result)
this.isShow = true;
this.deviceSN = result
this.GetDeviceList(result) //拿到结果触发请求
this.scancode = false;
}
},
}
}
</script>