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     })    }   })