小程序点赞收藏功能的实现代码示例

本文介绍了小程序点赞收藏功能的实现代码示例，分享给大家，具体如下：

/收藏/

focusFavoriteTab: function (e) {
 var that = this;
 var isFocus = that.data.isFocus;
 console.log("isFocus", isFocus)
 var itemId = that.data.itemId;
 if (isFocus) {
 favoriteService.cancel(that, itemId).then((res) => {
 wx.showToast({
 title: "取消收藏",
 icon: 'success',
 duration: 1000
 });
 this.setData({
 isFocus: false,
 });
 })
 } else {
 favoriteService.add(that, itemId).then((res) => {
 wx.showToast({
 title: res.data == 1 ? "收藏成功" : "收藏失败",
 icon: 'success',
 duration: 1000
 });
 this.setData({
 isFocus: true,
 });
 });
 }
 },

/点赞/

focuslikeTab: function (e) {
 var that = this;
 var isLike = that.data.isLike;
 let itemDetail = this.data.itemDetail 
 var itemId = that.data.itemId;
 if (isLike) {
 itemService.cancellike(that, itemId).then((res) => {
 wx.showToast({
 title: "点赞取消",
 icon: 'success',
 duration: 1000
 });
 itemDetail.liked--;
 this.setData({
 itemDetail:itemDetail
 });
 this.setData({
 isLike: false,
 });
 })
 } else {
 itemService.addlike(that, itemId).then((res) => {
 wx.showToast({
 title: res.data == 1 ? "点赞成功" : "点赞失败",
 icon: 'success',
 duration: 1000
 });
 itemDetail.liked++;
 this.setData({
 itemDetail: itemDetail
 });
 this.setData({
 isLike: true,
 });
 });
 }
 },

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 
 }) 
 } 
 }) 

重点注意代码：

（1）要把所有已经点过赞的留言id给存储到本地缓存之中，这样如果重复点赞的，就可以判断出来，并取消点赞，取消点赞的同时要去掉缓存中的id；

（2）新增点赞和取消点赞用到同一个api，通过isadd=1或者isadd=0来判断是新增还是取消点赞

（3）为了不频繁去读取留言列表，可以直接调用this.data.message,并通过循环遍历改变某个留言的点赞数，然后直接重新赋值，就能动态改变点赞数！