A页面
switch: function (e) {
    var aa = ‘UNNZVUf5qkM=‘;//拼接到url的参数
    var urls = encodeURIComponent(aa);//先encodeURIComponent
    wx.navigateTo({
      url: ‘/pages/teaTestWork/teaTestWork?id=‘ + urls,
    })
    
  },

B页面
onLoad: function (options) {
  
    console.log(decodeURIComponent(options.id));//结果为UNNZVUf5qkM=
    
  },