Question

我想将API的输出分成不同的页面。我想这样称呼他们：http://127.0.0.1:3000/api/articles/0/<API-TOKEN>

返回第一页的2-3篇等文章。

可在此处找到完整代码：https://github.com/DJviolin/horgalleryNode/blob/master/routes/api.js

我有虚拟数据JSON文件：

[
  {
    "articles": [
      {
        "id": "0",
        "url": "audrey-hepburn",
        "title": "Audrey Hepburn",
        "body": "Nothing is impossible, the word itself says 'I'm possible'!",
        "category": "foo",
        "tags": [ "foo" ]
      },
      {
        "id": "1",
        "url": "walt-disney",
        "title": "Walt Disney",
        "body": "You may not realize it when it happens, but a kick in the teeth may be the best thing in the world for you.",
        "category": "foo",
        "tags": [ "foo", "bar" ]
      },
      {
        "id": "2",
        "url": "unknown",
        "title": "Unknown",
        "body": "Even the greatest was once a beginner. Don't be afraid to take that first step.",
        "category": "bar",
        "tags": [ "foo", "bar", "baz" ]
      },
      {
        "id": "3",
        "url": "neale-donald-walsch",
        "title": "Neale Donald Walsch",
        "body": "You are afraid to die, and you're afraid to live. What a way to exist.",
        "category": "bar",
        "tags": [ "foo", "bar", "baz" ]
      }
    ]
  },
  {
    "users": [
      { "name": "Admin" },
      { "name": "User" }
    ]
  }
]

以这种方式调用我的API路由器：

function fsAsync(callback) {
  fs.readFile(__dirname + '/../public/articles/data.json', 'utf8', function(err, data) {
    if (err) {
      return callback(err);
    }
    callback(null, JSON.parse(data));
  });
};

我在这条路线上打电话给每一篇文章：http://127.0.0.1:3000/api/articles/<API-TOKEN>

router.get('/articles/:token', function(req, res) {
  fsAsync(function(err, data) {
    if (err) {
      return res.send(err);
    }
    var articles = data[0].articles;

    var q = articles.filter(function (article) {
      // return article.id === req.params.id;
      return article && apiToken === req.params.token;
    });
    res.json(q);
  });
});

但是，当我渲染此API路线时，我想将此API的输出分隔到不同的页面：http://127.0.0.1:3000/api/articles/0/<API-TOKEN>

我尝试实施此处描述的array.slice方法：https://stackoverflow.com/a/8495740/1442219

如何实现？

谢谢！

更新

如果我将JSON对象拆分成块，有一件事可能会导致问题，而不是先从该对象解析所有内容，而不是决定拆分的位置？如果用户访问567的最后一页怎么办？这意味着代码首先必须通过数百万行查询才能返回想要的页面？如果它是数据库，而不是具有虚拟数据的JSON，该怎么办？在排序中，从JSON / Mongodb /等来源返回博客特定页面的最佳做法是什么？

更新2：

这将从对象返回前两篇文章：

// http://127.0.0.1:3000/api/articles/c/<API-TOKEN>
router.get('/articles/c/:token', function(req, res) {
  fsAsync(function(err, data) {
    if (err) {
      return res.send(err);
    }
    var articles = data[0].articles;

    var count = 0;
    var countMultiply = count * 2;
    var a = countMultiply + 0;
    var b = countMultiply + 2;
    var c = articles.slice(a, b);
    console.log(c);

    var q = c.filter(function (article) {
      // return article.id === req.params.id;
      return article && apiToken === req.params.token;
    });
    res.json(q); // (0*2+0=0, 0*2+2=2), (1*2+0=2, 1*2+2=4), (2*2+0=4, 2*2+2=6), (3*2+0=6, 3*2+2=8)
  });
});

如何自动将此功能用于页面分隔符的0,1,2,3？因此，http://127.0.0.1:3000/api/articles/0/<API-TOKEN>网址的第一页返回文章(0,2)而第http://127.0.0.1:3000/api/articles/1/<API-TOKEN>网址的第二页返回文章(2,4)？

Answer 1

更新3：

看起来它正在运作：

// http://127.0.0.1:3000/api/articles/page/0/<API-TOKEN>
router.get('/articles/page/:id/:token', function(req, res) {
  fsAsync(function(err, data) {
    if (err) {
      return res.send(err);
    }
    var articles = data[0].articles.reverse();

    var count = req.params.id; // Page number
    var multiplier = 2; // Posts per page

    var countResult = count * multiplier;
    var a = countResult + 0;
    var b = countResult + multiplier;
    var c = articles.slice(a, b);

    var pagesLength = articles.length / multiplier;
    var pagesLengthCeil = Math.ceil(pagesLength); // Sum of all pages

    console.log('pagesLengthCeil: ' + pagesLengthCeil);
    console.log(c);

    var q = c.filter(function (article) {
      // return article.id === req.params.id;
      return article && apiToken === req.params.token;
    });
    res.json(q); // (0*2+0=0, 0*2+2=2), (1*2+0=2, 1*2+2=4), (2*2+0=4, 2*2+2=6), (3*2+0=6, 3*2+2=8)
  });
});

但是我仍然不知道用巨大的JSON文件或数据库来做这个是一种有效的方法吗？

将JSON API的对象拆分为快递应用程序中的块

1 个答案: