微信小程序实现缓存根据不同的id来进行设置和读取缓存

onLoad: function (options) { 
  var that = this; 
  var activityId = options.activityId; 
  //报名表人数统计 
  wx.request({ 
   url: domain + '/activityjoin/selectJoinCount', 
   data: { activityId: activityId }, 
   method: 'GET', 
   success: function (res) { 
   
    var jonNums = res.data; 
    var newNumber = jonNums.count - wx.getStorageSync('jonNumsed' + activityId) //获取缓存 
  
    wx.setStorageSync('jonNumsed' + activityId, jonNums.count);//设置缓存 
 
    if (jonNums.count) { 
     activityId     
    } 
 
    jonNums.joinCount = jonNums.count; 
 
    that.setData({ newNumber: newNumber, jonNums: jonNums }) 
   } 
  }) 
  
 },