uniapp应用如何实现二维码生成和扫码识别

{  "dependencies": {    "uni-qr": "^1.0.0"  }}

<template><view class="content"><qr :text="qrText" :size="qrSize"></qr></view></template><script>  import qr from 'uni-qr'  export default {    data() {      return {        qrText: 'http://www.example.com',        qrSize: 200      }    },    components: {      qr    }  }</script>

{  "dependencies": {    "uni.scanCode": "^1.0.0"  }}

<template><view class="content"><view class="result">{{ scanResult }}</view><button>扫码识别</button>  </view></template><script>  export default {    data() {      return {        scanResult: ''      }    },    methods: {      scanCode() {        uni.scanCode({          success: (res) => {            if (res.result) {              this.scanResult = res.result            }          }        })      }    }  }</script>