如何在Vue.js中使用Apollo？

在Vue.js中使用Apollo需要引入apollo-boost和vue-apollo两个库。首先，安装这两个库：

1. 在终端中运行npm install apollo-boost vue-apollo --save命令，安装所需的依赖库。

2. 在Vue.js组件中引入vue-apollo库：

import Vue from "vue"
import VueApollo from "vue-apollo"
import ApolloClient from "apollo-boost"

// Create the apollo client
const apolloClient = new ApolloClient({
  uri: "https://api.example.com/graphql"
})

// Install the vue plugin
Vue.use(VueApollo)

// Create the apollo provider
const apolloProvider = new VueApollo({
  defaultClient: apolloClient,
})

// Create the vue instance
new Vue({
  el: "#app",
  apolloProvider,
  // ...
})

3. 在Vue.js组件中使用Apollo：

import gql from "graphql-tag"

export default {
  apollo: {
    // Query
    posts: gql`
      query {
        posts {
          id
          title
          content
        }
      }
    `,

    // Mutation
    createPost: gql`
      mutation($title: String!, $content: String!) {
        createPost(title: $title, content: $content) {
          id
          title
          content
        }
      }
    `,
  },
  // ...
}

4. 在Vue.js组件中使用查询结果：

<template>
  <div>
    <ul>
      <li v-for="post in posts" :key="post.id">
        <h2>{{ post.title }}</h2>
        <p>{{ post.content }}</p>
      </li>
    </ul>

    <form @submit.prevent="createPost">
      <input v-model="title" type="text" placeholder="Title">
      <textarea v-model="content" placeholder="Content"></textarea>
      <button type="submit">Create Post</button>
    </form>
  </div>
</template>

<script>
export default {
  apollo: {
    posts: {
      query: gql`
        query {
          posts {
            id
            title
            content
          }
        }
      `,
    },

    createPost: {
      mutation: gql`
        mutation($title: String!, $content: String!) {
          createPost(title: $title, content: $content) {
            id
            title
            content
          }
        }
      `,
    },
  },

  data() {
    return {
      title: "",
      content: "",
    }
  },

  methods: {
    async createPost() {
      const response = await this.$apollo.mutate({
        mutation: this.createPost,
        variables: {
          title: this.title,
          content: this.content,
        },
      })

      // Do something with the response
      console.log(response)

      // Reset the form
      this.title = ""
      this.content = ""
    },
  },
}
</script>