yelaixiang/pages/scan/scan.js

// pages/scan/scan.js
const App = getApp();
Page({

  /**
   * 页面的初始数据
   */
  data: {
    navTop:App.globalData.navTop,
  },
 isOnlyDigits(str) { 
     const regex = /^[0-9]+$/; return regex.test(str); 
 },
  scanQRCode() {
    wx.scanCode({
      success: (res) => {
        console.log(res,"二维码扫描结果"); // 输出扫描结果
        if(this.isOnlyDigits(res.result)){
            wx.setStorage({
                key: 'exhibition_id',
                data: res.result,
            })
            setTimeout(function () {
                wx.switchTab({
                    url: '../index/index'
                })
            }, 400)
        }else{
            wx.showToast({
                title: '请扫描正确的二维码！',
                icon: 'none',
                duration: 2000
              });
        }
      },
      fail: (res) => {
        console.log(res);
      }
    });
  },
  onLoad(options) {

  },
})