Vue3中进行二维码的生成与解码实现详解

npm i qrcode.vue --save // 用来生成二维码的qr库
npm i jsqr --save // 用来解码的库

import QrcodeVue from 'qrcode.vue';

<template>
    <div>
        <qrcode-vue :value="value" :size="size" level="H"></qrcode-vue>
    </div>
</template>
<script setup>
import QrcodeVue from 'qrcode.vue';
components: {
QrcodeVue
};
const value = JSON.stringify({name: 'limiang', age: 14});  //传入的值，要求是字符串,需要将对象进行转换
const size = 200; //二维码大小
</script>

   img.src= file.content;

// 将图像绘制到canvas中
const canvas = document.createElement('canvas');
const ctx = canvas.getContext("2d");
ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
// 获取图像数据
const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);

const qrdata = jsqr (imageData.data, imageData.width, imageData.height);

<template>
    <div>
        <van-uploader :after-read="afterRead" />
    </div>
</template>
<script setup>
import jsqr from 'jsqr'
function afterRead(file) {
// 创建图像元素
const img = new Image();
img.onload = () => {
// 将图像绘制到canvas中
const canvas = document.createElement('canvas');
const ctx = canvas.getContext("2d");
ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
// 获取图像数据
const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
//二维码解码
const qrdata = jsqr(imageData.data, imageData.width, imageData.height);
//字符串转对象
let option = JSON.parse(qrdata.data);
console.log(option);
}
img.src= file.content;
}
</script>