微信小程序实现列表页的点赞和取消点赞功能

/*更新点赞*/ 
 update_zan:function(e){ 
  var that = this; 
  var data = e.currentTarget.dataset; 
  var mid = data.mid; 
  var cookie_mid = wx.getStorageSync('zan') || [];//获取全部点赞的mid 
  var isadd = 1; 
  var newmessage = []; 
  if (cookie_mid.includes(mid)){//说明已经点过赞,取消赞 
   isadd = 0; 
   var m = 0; 
   for (var j in cookie_mid){ 
    if(cookie_mid[j] != mid){ 
     newmessage[m] = cookie_mid[j]; 
     m++ 
    } 
   } 
   wx.setStorageSync('zan', newmessage);//删除取消赞的mid 
  }else{ 
   cookie_mid.unshift(mid); 
   wx.setStorageSync('zan', cookie_mid);//新增赞的mid 
  } 
  wx.request({ 
   url: app.globalData.api.api_system, 
   data: { 
    action: 'zannum', 
    mid: mid, 
    isadd: isadd, 
    wxid: app.globalData.wxid 
   }, 
   method: 'GET', 
   // header: {},  
   success: function (res) { 
    var message = that.data.message; 
    for (var i in message) { 
     if(message[i].mid == mid){ 
      if(isadd){ 
       message[i].zan = parseInt(message[i].zan) + 1 
      }else{ 
       message[i].zan = parseInt(message[i].zan) - 1 
      } 
       
     } 
    } 
    that.setData({ 
     message: message 
    }) 
   } 
  })