微信小程序使用Promise异步回调,以及使用简单递归算法

//分享好友
onShareAppMessage: function () {
    var that = this;
    return new Promise((resolve,reject)=>{
      wx.showLoading({
        title: '正在生成中...',
        icon: 'none'
      })
      var index = 0; //计数循环
      var recursiveFunc = function () {
        if (isEmty(that.data.shareItemImageUrl) && index < 10) {
          setTimeout(() => {
            index++; //计数+1
            recursiveFunc(); //再次执行
          }, 500);
        } else {
          //递归结束退出递归
          wx.hideLoading();
          resolve({
            title: that.data.shareTitle,
            path: 'pages/index/home?id=' + that.data.shareId,
            imageUrl:that.data.shareItemImageUrl
          })
        }
      }
      recursiveFunc(); //执行
    })
},