我是个小菜鸟。。。。最近在学习一些微信小程序的知识，昨天写一个简单的收藏功能的时候遇到一些小错误，卡了很久。。。。在网上找答案的时候也找到很多实现的代码，但是我测试的时候还是会报错，后来终于发现了症结所在…555555555
这里贴一下我改之后的代码，如果有人有需要的话可以看看，因为我自己昨天真的找的很绝望…（也可能已经有大佬发过了，只是我没找到2333333）

修改之前的（昨天在网上找的示例代码）：

  // 在第一次点进detail界面（所有文章记录均为未读时，postsCollected为空）时，不会报错；  // 但是当读过任意一篇文章后，再去点击没读过的文章，就会报错，除非这时就点击收藏按钮（点一次以上都可以），之后再点进来这篇文章才不会报错；如果不收藏，就会一直报错 var postsCollected = wx.getStorageSync('posts_Collected')    if (postsCollected) {      var postCollected = postsCollected[postId]      this.setData({        collected: postCollected      })    }    else {      var postsCollected = {}      postsCollected[postId] = false;      wx.setStorageSync('posts_Collected', postsCollected);    }  },  onCollectTap: function (event) {    var postsCollected = wx.getStorageSync('posts_Collected');    var postCollected = postsCollected[this.data.currentPostId];    //收藏变成未收藏，未收藏变成收藏    postCollected = !postCollected;    postsCollected[this.data.currentPostId] = postCollected;    //更新文章是否收藏的缓存值    wx.setStorageSync('posts_Collected', postsCollected);    //更新数据绑定变量，从而实现切换图片    this.setData({      collected: postCollected    })  }

修改之后的：

var postsCollected = wx.getStorageSync('posts_collected');    // if里面写postsCollected的话，会报错；    // 因为如果序号为0的文章读过了，而序号为1的文章没读过，那么postsCollected还是为真，    // 但是此时点击序号为1的文章，那么postsCollected[1]为空，赋值给postCollected，postCollected也为空；    // 则会说this.setData里面的collected没有定义    if (postsCollected[postId]) {      var postCollected = postsCollected[postId];      this.setData({        collected: postCollected      })    }     else if (postsCollected && !postsCollected[postId]){      postsCollected[postId] = false;      console.log(postsCollected[postId]);      wx.setStorageSync('posts_collected', postsCollected);      var postCollected = postsCollected[postId];      this.setData({        collected: postCollected      })    }    else {      var postsCollected = {};      postsCollected[postId] = false;      wx.setStorageSync('posts_collected', postsCollected);      var postCollected = postsCollected[postId];      this.setData({        collected: postCollected      })    }  },  onCollectTap: function(event) {    var postsCollected = wx.getStorageSync('posts_collected');    var postCollected = postsCollected[this.data.currentPostId];    postCollected = !postCollected;    postsCollected[this.data.currentPostId] = postCollected;    wx.setStorageSync('posts_collected', postsCollected);    this.setData({      collected: postCollected    })  }