如何使用 javascript 过滤和获取限制量的数据

Question

我有一个数组，其中包含一些 java 脚本对象，我正在使用 ejs 显示数据，但问题是 - 我必须在 req.params.id 的基础上过滤该数据并想要到接下来的 2 个数据对象..！过滤数据后 -- 请帮忙

我的代码是-

app.get("/:id", (req, res) => {
  const requestParams = _.lowerCase(req.params.id);

  let obj = blogData.find((o) => o.heading >= "Yoga-During-COVID");
  console.log(obj);
 
  blogData.forEach(function (post) {
    const storedTitel = _.lowerCase(post.heading);
    
    if (storedTitel === requestParams) {
      res.render("blogfullDetail", {
        date: post.date,
        heading: post.heading,
        subheading: post.subheading,
        discription: post.discription,
        discription2: post.discription2,
        author: post.author,
        authorImage: post.authorImage,
        mainImg: post.mainImg,
      });
    }
  });

});

数据文件-

Answer 1

使用 findIndex 和 slice 的组合。 findIndex returns 匹配元素的索引和 slice returns 从该索引到计算出的更高索引的子数组...

let blogData = [{
    id: 1,
    title: 'yoga is good'
  },
  {
    id: 32,
    title: 'yoga helps you stretch'
  },
  {
    id: 12,
    title: 'covid yoga is good too'
  },
  {
    id: 41,
    title: 'no such thing as too much yoga'
  },
  {
    id: 57,
    title: 'is hot yoga too hot'
  }
];

// say you need the post about covid...
let targetTitle = 'covid yoga is good too';
let index = blogData.findIndex(p => p.title === targetTitle);

// with the index, answer a slice of the blogs
// starting at that index, ending 3 later
let posts = blogData.slice(index, index + 3);
console.log(posts)

如何使用 javascript 过滤和获取限制量的数据

how to filter and get limit amount of data using javascript

javascript

ejs

node.js