> For the complete documentation index, see [llms.txt](https://easonwang.gitbook.io/class/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://easonwang.gitbook.io/class/node.jsreact.js4.md).

# 結合Node.js與React.js搭建論壇網站4

> 稍後記得把範例的mLab URL與帳號密碼改為你自己的

一樣先下載此單元的課程壓縮檔，然後解壓縮，之後使用`terminal`進入後輸入`npm install`

## 文章留言

LeaveMsgModal.js

## API 加上 token認證

使用JWT token

```javascript
const authToken = (req,res,next) => {
    const token = req.cookies.t;
    if (token) {
        jwt.verify(req.cookies.t, jwtSecret, (err, decoded) => {
            if(decoded){
                next();
            } else {
                res.end('token not correct');
            }
      });
    } else {
        res.end('no Token');
    }
}
```

api.js:211

```javascript
app.put('/leavemsg',authToken,(req,res) => {
    Post.findOne({ _id: req.body.id })
    .then(data => {
        let newComments = data.comments;
        newComments.push({
            title : req.body.title,
            content : req.body.content,
            authorAccount : req.body.authorAccount,
            userAvatar: req.body.userAvatar,
            date: Date.now() + 1000 * 60 * 60 * 8
        })
    Post.update({ _id: req.body.id },{ $set : {
        comments: newComments,
        lastModify : Date.now() + 1000 * 60 * 60 * 8
        }})
        .then(data => {
             res.end(JSON.stringify(data))
        })
    })
})
```

## 聊天室

Chatroom.js

## Redis

1.一個使用者登入後，其他登入此帳號的裝置會被登出 login.js:59

2.記錄連線人數（顯示在terminal）