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！

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。