vue项目实现用户扫二维码实现支付功能

首先第一步是需要在命令行里面下载安装一个生成二维码的插件qrcodejs2,代码如下:

npm install qrcodejs2 -S

第二步封装一个组件:
模板如下代码:

<!-- 微信二维码 -->
<template>
<div class=''>
  <el-dialog
      title="微信扫码支付"
      :visible.sync="dialogData.dialogVisible"
      width="20%"
      v-dialogDrag
      center
      @close="close">
      <div id="qrcode" ref="qrcode" style="display:flex;justify-content:center">
      </div>
      <p style="text-align:center;margin:5px"><el-button type="primary" size="mini" @click="refresh">刷新二维码</el-button></p>
      <p style="text-align:center"><b>订单名称:{{dialogData.xxxx}}</b></p>
      <p style="text-align:center"><b>订单价格:{{dialogData.xxxx}}元</b></p>
      <p style="text-align:center"><b>数量:{{dialogData.xxx}}</b></p>
      <div slot='footer' class="dialog-footer">
         <el-button type="primary" @click="confirm">已支付</el-button>
         <el-button type="warning" @click='cancel'>取消</el-button>
      </div>
  </el-dialog>
</div>
</template>

第三步将下载的依赖引入注册并且实例一下,代码如下:

import QRCode from 'qrcodejs2'
export default {
// import引入的组件需要注入到对象中才能使用
  components: {QRCode},
  props: ['dialogData'],
  inject: ['reload'],
  data () {
    // 这里存放数据
    return {
      content: ''
    }
  },
  // 方法集合
  methods: {
    qrcodedraw () { // 生成二维码
      this.qrcode = new QRCode(this.$refs.qrcode, {
        width: 100, // 二维码宽度
        height: 100, // 二维码高度
        text: this.dialogData.codeUrl,
        correctLevel: QRCode.CorrectLevel.H
      })
    },
    refresh () {
      this.$http.rule.xxxxxxxx({orderId: this.dialogData.item.orderId, paymentMethod: 1}).then(res => {
        if (res.data.code === '200' && res.data.value === 'success') {
          this.$message.success('二维码刷新成功')
          this.content = res.data.data.codeUrl
          document.getElementById('qrcode').innerHTML = ''  //点击一次刷新将之前的二维码内容清空
          this.$nextTick(() => {
            this.qrcodeScan()
          })
        }
      }).catch(() => {})
    },
    close () {
      this.$message.warning('支付页面关闭!')
      this.dialogData.dialogVisible = false
      this.reload()
    },
    confirm () {
      this.$http.rule.getMyOrdersList({current: 1, size: 5, orderId: this.dialogData.orderId}).then(res => {
        if (res.data.data.records[0].orderState === '2') {
          this.$message.success('支付成功!')
          this.dialogData.dialogVisible = false
          this.$router.push({path: '/home/busaccount', query: {showview: 1}})
          this.reload()
        } else if (res.data.data.records[0].orderState === '4') {
          this.$message.error('支付失败!')
          this.dialogData.dialogVisible = false
          this.$router.push({path: '/home/busaccount', query: {showview: 1}})
          this.reload()
        } else if (res.data.data.records[0].orderState === '1') {
          this.$message.warning('微信未支付!')
          this.dialogData.dialogVisible = false
          this.$router.push({path: '/home/busaccount', query: {showview: 1}})
          this.reload()
        }
      })
    },
    cancel () {
      this.$message.warning('支付取消!')
      this.reload()
    }
  },
  // 生命周期 - 挂载完成（可以访问DOM元素）
  mounted () {
    this.$nextTick(() => {
      this.qrcodedraw()
    })
  },
}

支付宝支付后端方式也是返回一个链接也可用上述方式实现显示出来
效果如下图: