小程序?qū)崿F(xiàn)列表點(diǎn)贊功能

 //點(diǎn)贊處理函數(shù)（xx.js文件）
 zan: function (item_id) {
  var that = this;
  var show;//傳遞到數(shù)據(jù)庫(kù)點(diǎn)贊的狀態(tài)   
  var cookie_mid = wx.getStorageSync('zan')||[];//獲取全部點(diǎn)贊的mid    
  var newmessage = [];

  for (var i = 0; i < that.data.item_list.length; i++) {
   if (that.data.item_list[i].id == item_id) {//遍歷找到對(duì)應(yīng)的id
    var num = that.data.item_list[i].like_num;//當(dāng)前贊數(shù)
    var isshow; //點(diǎn)贊的狀態(tài)

    if (cookie_mid.includes(item_id)) {//說(shuō)明已經(jīng)點(diǎn)過(guò)贊,取消贊  
     for (var j = 0; j < cookie_mid.length; j++) {
      if (cookie_mid[j] == item_id) {
       cookie_mid.splice(j, 1);//刪除取消贊的mid 
      }      
     }
     --num;
     isshow = 0;//點(diǎn)贊的狀態(tài)
     that.setData({
      [`item_list[${i}].like_num`]: num, //es6模板語(yǔ)法（反撇號(hào)字符）
      [`item_list[${i}].favor_img`]: "../../image/favor.png",
     })
     wx.setStorageSync('zan', cookie_mid);
     wx.showToast({
      title: "取消點(diǎn)贊!",
      icon: 'none'
     }) 
     //console.log("前端取消點(diǎn)贊"+isshow)

    } else {
     isshow = 1;//點(diǎn)贊的狀態(tài)
     ++num;
     that.setData({
      [`item_list[${i}].like_num`]: num,//es6模板語(yǔ)法（反撇號(hào)字符）
      [`item_list[${i}].favor_img`]: "../../image/favor_press.png",
     })
     cookie_mid.unshift(item_id);//新增贊的mid
     wx.setStorageSync('zan', cookie_mid);
     wx.showToast({
      title: "點(diǎn)贊成功!",
      icon: 'none'
     })
     //console.log("前端點(diǎn)贊成功" + isshow)
    }
    //console.log(cookie_mid); 
    //點(diǎn)贊數(shù)據(jù)同步到數(shù)據(jù)庫(kù)
    wx.request({
     url: 'https://xxx.xxxx.xxx/zan.php',
     method: 'POST',
     header: { 'Content-Type': 'application/x-www-form-urlencoded' },
     data: {
      id: item_id,
      show: isshow,
     },
     success: function (res) {
      //console.log("show:" +show)
      //console.log(res.data);
     }
    }) 
   }
  }
 },

/**
 * 點(diǎn)贊
 */
 favorclick: function (options){
  var item_id = options.currentTarget.dataset.id;//此處找到列表的id
  //console.log(item_id);//列表id
  this.zan(item_id);
 },