---
id: 58966a17f9fc0f352b528e6d
title: 注册新用户
challengeType: 2
forumTopicId: 301561
dashedName: registration-of-new-users
---

# --description--

现在我们需要为新用户添加注册帐号的功能。 首先我们需要在主页的 `res.render` 接收的变量对象中添加 `showRegistration: true`。 此时刷新页面，你会看到页面上已经显示了我们在 `index.pug` 文件中定义的注册表单。 这个表单设置了请求路径 `/register`，并将请求方法设置成 **POST**，所以我们需要在服务器接受 **POST** 请求，且在数据库中创建用户对象。

用户注册的逻辑：注册新用户 > 认证新用户 > 重定向到 /profile。

对于步骤一的注册新用户，详细逻辑是这样的：用 findOne 命令查询数据库 > 如果返回了用户对象，则表示用户存在，然后返回主页；*或者*如果用户未定义且没有报错，则会将包含用户名和密码的用户对象通过 “insertOne” 添加到数据库，只要没有报错则会继续*下一步*：认证新用户——我们已经在 */login* 路由的 POST 请求中写好了这部分逻辑。

```js
app.route('/register')
  .post((req, res, next) => {
    myDataBase.findOne({ username: req.body.username }, function(err, user) {
      if (err) {
        next(err);
      } else if (user) {
        res.redirect('/');
      } else {
        myDataBase.insertOne({
          username: req.body.username,
          password: req.body.password
        },
          (err, doc) => {
            if (err) {
              res.redirect('/');
            } else {
              // The inserted document is held within
              // the ops property of the doc
              next(null, doc.ops[0]);
            }
          }
        )
      }
    })
  },
    passport.authenticate('local', { failureRedirect: '/' }),
    (req, res, next) => {
      res.redirect('/profile');
    }
  );
```

完成上述要求后，请提交你的页面链接。 如果你遇到了问题，可以参考[这里](https://gist.github.com/camperbot/b230a5b3bbc89b1fa0ce32a2aa7b083e)的答案。

**注意：**接下来的挑战可能会在运行 *picture-in-picture*（画中画）模式的浏览器中出现问题。 如果你使用的线上 IDE 提供在 IDE 内预览 app 的功能，请考虑打开新的标签页预览。

# --hints--

注册路由和显示主页。

```js
(getUserInput) =>
  $.get(getUserInput('url') + '/_api/server.js').then(
    (data) => {
      assert.match(
        data,
        /showRegistration:( |)true/gi,
        'You should be passing the variable showRegistration as true to your render function for the homepage'
      );
      assert.match(
        data,
        /register[^]*post[^]*findOne[^]*username:( |)req.body.username/gi,
        'You should have a route accepted a post request on register that querys the db with findone and the query being username: req.body.username'
      );
    },
    (xhr) => {
      throw new Error(xhr.statusText);
    }
  );
```

注册功能应可以正常运行。

```js
async (getUserInput) => {
  const url = getUserInput('url');
  const user = `freeCodeCampTester${Date.now()}`;
  const xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function () {
    if (this.readyState == 4 && this.status == 200) {
      test(this);
    } else {
      throw new Error(`${this.status} ${this.statusText}`);
    }
  };
  xhttp.open('POST', url + '/register', true);
  xhttp.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
  xhttp.send(`username=${user}&password=${user}`);
  function test(xhttpRes) {
    const data = xhttpRes.responseText;
    assert.match(
      data,
      /Profile/gi,
      'Register should work, and redirect successfully to the profile.'
    );
  }
};
```

登录功能应可以正常运行。

```js
async (getUserInput) => {
  const url = getUserInput('url');
  const user = `freeCodeCampTester${Date.now()}`;
  const xhttpReg = new XMLHttpRequest();
  xhttpReg.onreadystatechange = function () {
    if (this.readyState == 4 && this.status == 200) {
      login();
    } else {
      throw new Error(`${this.status} ${this.statusText}`);
    }
  };
  xhttpReg.open('POST', url + '/register', true);
  xhttpReg.setRequestHeader(
    'Content-type',
    'application/x-www-form-urlencoded'
  );
  xhttpReg.send(`username=${user}&password=${user}`);
  function login() {
    const xhttp = new XMLHttpRequest();
    xhttp.onreadystatechange = function () {
      if (this.readyState == 4 && this.status == 200) {
        test(this);
      } else {
        throw new Error(`${this.status} ${this.statusText}`);
      }
    };
    xhttp.open('POST', url + '/login', true);
    xhttp.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
    xhttp.send(`username=${user}&password=${user}`);
  }
  function test(xhttpRes) {
    const data = xhttpRes.responseText;
    assert.match(
      data,
      /Profile/gi,
      'Login should work if previous test was done successfully and redirect successfully to the profile.'
    );
    assert.match(
      data,
      new RegExp(user, 'g'),
      'The profile should properly display the welcome to the user logged in'
    );
  }
};
```

退出登录功能应可以正常运行。

```js
(getUserInput) =>
  $.ajax({
    url: getUserInput('url') + '/logout',
    type: 'GET',
    xhrFields: { withCredentials: true }
  }).then(
    (data) => {
      assert.match(data, /Home/gi, 'Logout should redirect to home');
    },
    (xhr) => {
      throw new Error(xhr.statusText);
    }
  );
```

退出登录后，profile 页面应无法访问。

```js
(getUserInput) =>
  $.ajax({
    url: getUserInput('url') + '/profile',
    type: 'GET',
    crossDomain: true,
    xhrFields: { withCredentials: true }
  }).then(
    (data) => {
      assert.match(
        data,
        /Home/gi,
        'Profile should redirect to home when we are logged out now again'
      );
    },
    (xhr) => {
      throw new Error(xhr.statusText);
    }
  );
```

# --solutions--

```js
/**
  Backend challenges don't need solutions, 
  because they would need to be tested against a full working project. 
  Please check our contributing guidelines to learn more.
*/
```