本文介紹了小程序點贊收藏功能的實現代碼示例，分享給大家，具體如下：

/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" : "收藏失敗",     icon: 'success',     duration: 1000    });    this.setData({     isFocus: true,    });   });  } },

/點贊/

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: "點贊取消",     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 ? "點贊成功" : "點贊失敗",     icon: 'success',     duration: 1000    });    itemDetail.liked++;    this.setData({     itemDetail: itemDetail    });    this.setData({     isLike: true,    });   });  } },

取消點贊功能

 /*更新點贊*/  update_zan:function(e){   var that = this;   var data = e.currentTarget.dataset;   var mid = data.mid;   var cookie_mid = wx.getStorageSync('zan') || [];//獲取全部點贊的mid   var isadd = 1;   var newmessage = [];   if (cookie_mid.includes(mid)){//說明已經點過贊,取消贊    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);//刪除取消贊的mid   }else{    cookie_mid.unshift(mid);    wx.setStorageSync('zan', cookie_mid);//新增贊的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     })    }   }) 

重點注意代碼：

（1）要把所有已經點過贊的留言id給存儲到本地緩存之中，這樣如果重復點贊的，就可以判斷出來，并取消點贊，取消點贊的同時要去掉緩存中的id；