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！

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