QR code is a widely used information encoding method in modern society. Vue is a front-end framework. How to use Vue to generate QR codes?

1. Understand the principle of QR code generation

The principle of QR code generation is to convert a piece of text or a URL address into a picture, in which the text or URL is encoded. Address information. You can use third-party libraries to generate QR codes. This article introduces how to use the Qrcode.js library to generate QR codes. Qrcode.js is a lightweight, dependency-free QR code generation library.

2. Install the Qrcode.js library

In the Vue project, use npm to install the Qrcode.js library:

npm install qrcode

3. Use Qrcode.js to generate QR codes in Vue

Introduce the Qrcode.js library into the component:

import QRCode from 'qrcode'

Define the text that needs to be encoded in data:

data() {
  return {
    text: '這里是需要編碼的文本'
  }
}

Use Qrcode.js generates QR code:

methods: {
  generateCode() {
    QRCode.toCanvas(this.text, {
      width: 200,
      margin: 1
    }, (error, canvas) => {
      if (error) {
        console.error(error)
        return
      }
      // 在canvas的父元素中插入canvas元素
      this.$refs.canvasWrapper.appendChild(canvas)
    })
  }
}

Display the generated QR code in template:

<template>
  <div>
    <button @click="generateCode">生成二維碼</button>
    <div ref="canvasWrapper"></div>
  </div>
</template>

4. Complete code example

Complete code example in Vue component As follows:

<template>
  <div>
    <button @click="generateCode">生成二維碼</button>
    <div ref="canvasWrapper"></div>
  </div>
</template>

<script>
  import QRCode from 'qrcode'

  export default {
    data() {
      return {
        text: '這里是需要編碼的文本'
      }
    },
    methods: {
      generateCode() {
        QRCode.toCanvas(this.text, {
          width: 200,
          margin: 1
        }, (error, canvas) => {
          if (error) {
            console.error(error)
            return
          }
          // 在canvas的父元素中插入canvas元素
          this.$refs.canvasWrapper.appendChild(canvas)
        })
      }
    }
  }
</script>

5. Summary

Using the Qrcode.js library, you can easily and quickly generate QR codes in Vue, and you can customize the generated QR codes by setting parameters such as width and margins. QR code. Through the code examples introduced in this article, readers can further understand how to use the Qrcode.js library in Vue to generate QR codes.

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