VuePC端实现扫码登录功能示例代码

import {v4 as uuidv4} from "uuid"
import QRCode from "qrcodejs2"
 let timeStamp = new Date().getTime() // 生成时间戳，用于后台校验有效期
 let uuid = uuidv4()
 let content = `uid=${uid}&timeStamp=${timeStamp}`
 this.$nextTick(()=> {
     const qrcode = new QRCode(this.$refs.qrcode, {
       text: content,
       width: 180,
       height: 180,
       colorDark: "#333333",
       colorlight: "#ffffff",
       correctLevel: QRCode.correctLevel.H,
       render: "canvas"
     })
     qrcode._el.title = ''

export default {
  name: "qrCode",
  data() {
    return {
      codeStatus: 1, // 1- 未扫码 2-扫码通过 3-过期
      effectiveTime: 30, // 有效时间
      qrCodeTimer: null // 有效时长计时器
      uid: '',
      time: ''
    };
  },
  methods: {
    // 轮询获取二维码状态
    getQcodeStatus() {
      if(!this.qsCodeTimer) {
        this.qrCodeTimer = setInterval(()=> {
          // 二维码过期
          if(this.effectiveTime <=0) {
            this.codeStatus = 3
            clearInterval(this.qsCodeTimer)
            this.qsCodeTimer = null
            return
          }
          this.effectiveTime--
        }, 1000)
      }
    },
    // 刷新二维码
    refreshCode() {
      this.codeStatus = 1
      this.effectiveTime = 30
      this.qsCodeTimer = null
      this.generateORCode()
    }
  },

// 获取后台状态
   async checkQRcodeStatus() {
      const res = await checkQRcode({
        uid: this.uid,
        time: this.time
      })
      if(res && res.code == 200) {
        let codeStatus - res.codeStatus
        this.codeStatus =  codeStatus
        let loginData = res.loginData
        switch(codeStatus) {
          case 3:
             console.log("二维码过期")
             clearInterval(this.qsCodeTimer)
             this.qsCodeTimer = null
             this.effectiveTime = 0
           break;
           case 2:
             console.log("扫码通过")
             clearInterval(this.qsCodeTimer)
             this.qsCodeTimer = null
             this.$emit("login", loginData)
           break;
           case 1:
             console.log("未扫码")
             this.effectiveTime > 0  && this.checkQRcodeStatus()
           break;
           default:
           break;
        }
      } 
   },