如何进行分页？

Question

如何进行分页。我已经尝试了很多次，但我做不到。我必须在没有 Laravel 的情况下进行分页。问题是我不能做一个循环显示页数，每页应该有10个帖子，总共有98个帖子。我制作了要计算的属性，因此您可以找出将有多少页。我做了一个有效的页面切换。但是由于某种原因，显示页数的循环对我不起作用，我不明白问题出在哪里？

Screenshot

我的 Vue js： 从'axios'导入axios；

export default {
  name: 'app',
  data () {

    return{
      counter: 1,
      zero: 0,
      posts: [],
      createTitle: '',
      createBody: '',
      visiblePostID: '',

    }
  },

  watch: {
      counter: function(newValue, oldValue) {
          this.getData()
      }
  },
  created(){
      this.getData()
   },

   computed: {
     evenPosts: function(posts){
       return Math.ceil(this.posts.length/10);

       }
     },

   methods: {
      getData() {
          axios.get(`http://jsonplaceholder.typicode.com/posts?_start=${this.counter}+${this.zero}&_limit=10`).then(response => {
              this.posts = response.data
          })
      },
      // even: function(posts) {
      //   return Math.ceil(this.posts.length/10)
      // },

        deleteData(index, id) {
          axios.delete('http://jsonplaceholder.typicode.com/posts/' + id)
                    .then(response => {
                      console.log('delete')
                        this.posts.splice(index, 1);
                      })
                    .catch(function(error) {
                        console.log(error)
                    })
                  },
        addPost() {
          axios.post('http://jsonplaceholder.typicode.com/posts/', {
            title: this.createTitle,
            body: this.createBody
            }).then((response) => {
              this.posts.unshift(response.data)
              })
            },
        changePost(id, title, body) {
          axios.put('http://jsonplaceholder.typicode.com/posts/' + id, {
            title: title,
            body: body
          })
        },
      },
  }

我的html：

<div id="app">
      <div class="smallfon">
        <div class="blocktwitter"><img src="src/assets/twitter.png"  class="twitter"/></div>
        <div class="addTextPost">Add a post</div>
        <input type="text" v-model="createTitle" class="created"/>
        <input type="text" v-model="createBody" class="created"/>
        <div><button  @click="addPost()" class="addPost">AddPost</button></div>
        <div class="post1">
          <div class="yourPosts">Your Posts</div>
          <ul>
            <li v-for="(post, index) of posts" class="post">
              <p><span class="boldText">Title:</span> {{ post.title }}</p>
              <p><span class="boldText">Content:</span> {{ post.body }}</p>
              <button  @click="deleteData(index, post.id)" class="buttonDelete">Delete</button>
              <button @click="visiblePostID = post.id" class="buttonChange">Change</button>
              <div v-if="visiblePostID === post.id" class="modalWindow">
              <div><input  v-model="post.title" class="changePost"><input  v-model="post.body" class="changePost"></div>
              <button type="button" @click="changePost(post.id, post.title, post.body)" class="apply">To apply</button>
            </div>
            </li>
          </ul>
              <button type="button" @click="counter -=1" class="prev">Предыдущая</button>
              <!-- <div class="counter">{{ counter }}</div> -->  <span v-for="n in evenPosts" :key="n.id">{{ n }} </span>
              <button type="button" @click="counter +=1" class="next">Следущая</button>

              <!-- <span v-for="n in evenPosts" :key="n.id">{{ n }} </span> -->

        </div>
      </div>
    </div>

Answer 1

如果将限制绑定到获取请求 (axios.get(...&_limit=10))，则无法返回分页计数，因为计算出的 evenPost 属性将始终返回 1，即 Math.ceil(10/10) == 1

要修复分页，请删除参数查询以获取数据：

getData() {
  axios.get('https://jsonplaceholder.typicode.com/posts').then(response => {
    this.posts = response.data
  })
}

然后将默认的counter页面更改为0，并添加一个计算属性以返回10个基于它的帖子：

data () {
  return {
    counter: 0,
    //...
  }
},
computed: {
   paginatedPosts() {
    const start = this.counter * 10;
    const end = start + 10;
    return this.posts.slice(start, end);
  }
}

现在你可以迭代这个属性了：

<ul>
  <li v-for="(post, index) of paginatedPosts" class="post">
    ...
  </li>
</ul>

Basic live example