Implementation example of scan code payment in vue project (with demo)

<template>
  <div>
    <el-dialog
      class="dialog-pay"
      title=""
      :visible.sync="dialogVisible"
      :show-close="false"
      @close="handleClosePay"
    >
      <div class="content">
        <p class="tip">{{ pay.title }}</p>
        <p class="tip">
          Payment amount: <span class="small">￥</span
          ><span class="large">{{ pay.money }}</span>
        </p>
        <img
          class="pic"
          :style="{ opacity: btnDisabled ? 1 : 0.3 }"
          :src="pay.url"
        />
        <el-button
          class="btn"
          :class="btnDisabled ? 'disabled' : ''"
          type="primary"
          :disabled="btnDisabled"
          @click="handleRefreshCode"
          >{{ btnText }}</el-button
        >
      </div>
    </el-dialog>
  </div>
</template>

watch:
    'pay.show': {
      handler(val) {
        if (val) {
          this.dialogVisible = this.pay.show
          setTimeout(this.handleReportPayNotify(), 5000)
        }
      },
      immediate: true
    }
},

handleCountDown() {
  if (this.second == 1) {
    if (this.refresh) {
      this.second = 60
      this.btnDisabled = false
      this.btnText = 'Click refresh to get the QR code again'
      if (this.timer) {
        clearInterval(this.timer)
      }
    } else {
      this.$emit('closePay', { type: 'fail' })
      clearInterval(this.timer)
      this.$message.warning('Waiting time is too long, please re-initiate payment')
    }
  } else {
    this.second--
    this.btnDisabled = true
    this.btnText = `${this.second} seconds left until the QR code expires`
    this.downTimer = setTimeout(() => {
      this.handleCountDown()
    }, 1000)
  }
},

handleClosePay() {
  if (this.timer) {
    clearInterval(this.timer)
  }
  if (this.downTimer) {
    clearTimeout(this.downTimer)
  }
  this.$emit('closePay', { type: 'fail' })
  this.$message.warning('You have canceled payment')
},

handleReportPayNotify() {
      let num = 0
      this.timer = setInterval(() => {
        num++
        this.pay.fn().then(res => {
          if (res.status == 111111) {
            this.$emit('closePay', { type: 'success' })
            clearInterval(this.timer)
          }
        })
        if (num == 12) {
          this.$emit('closePay', { type: 'fail' })
          clearInterval(this.timer)
          this.$message.warning('Waiting time is too long, please re-initiate payment')
        }
      }, 5000)
    }

  beforeDestroy() {
    if (this.timer) {
      clearInterval(this.timer)
    }
    if (this.downTimer) {
      clearTimeout(this.downTimer)
    }
  }
}

<script>
export default {
  name: 'WechatPay',
  props: {
    pay: Object
  },
  data() {
    return {
      dialogVisible: false,
      btnDisabled: true,
      btnText: '',
      second: 60,
      timer: null,
      refresh: true
    }
  },
  watch:
    'pay.show': {
      handler(val) {
        if (val) {
          this.dialogVisible = this.pay.show
          setTimeout(this.handleReportPayNotify(), 5000)
        }
      },
      immediate: true
    }
  },
  mounted() {
    this.handleCountDown()
  },
  methods: {
    /**
     * @descripttion: Refresh QR code*/
    handleRefreshCode() {
      this.$bus.$emit('refreshCode')
      this.handleCountDown()
      this.handleReportPayNotify()
      this.refresh = false
    },
    /**
     * @descripttion: QR code countdown*/
    handleCountDown() {
      if (this.second == 1) {
        if (this.refresh) {
          this.second = 60
          this.btnDisabled = false
          this.btnText = 'Click refresh to get the QR code again'
          if (this.timer) {
            clearInterval(this.timer)
          }
        } else {
          this.$emit('closePay', { type: 'fail' })
          clearInterval(this.timer)
          this.$message.warning('Waiting time is too long, please re-initiate payment')
        }
      } else {
        this.second--
        this.btnDisabled = true
        this.btnText = `${this.second} seconds left until the QR code expires`
        this.downTimer = setTimeout(() => {
          this.handleCountDown()
        }, 1000)
      }
    },
    /**
     * @descripttion: listen for payment pop-up window closing*/
    handleClosePay() {
      if (this.timer) {
        clearInterval(this.timer)
      }
      if (this.downTimer) {
        clearTimeout(this.downTimer)
      }
      this.$emit('closePay', { type: 'fail' })
      this.$message.warning('You have canceled payment')
    },
    /**
     * @descripttion: monitor payment callback results*/
    handleReportPayNotify() {
      let num = 0
      this.timer = setInterval(() => {
        num++
        this.pay.fn().then(res => {
          if (res.status == 111111) {
            this.$emit('closePay', { type: 'success' })
            clearInterval(this.timer)
          }
        })
        if (num == 12) {
          this.$emit('closePay', { type: 'fail' })
          clearInterval(this.timer)
          this.$message.warning('Waiting time is too long, please re-initiate payment')
        }
      }, 5000)
    }
  },
  beforeDestroy() {
    if (this.timer) {
      clearInterval(this.timer)
    }
    if (this.downTimer) {
      clearTimeout(this.downTimer)
    }
  }
}
</script>