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 
 }) 
 } 
 })