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export default {
  // 课程章节列表
  getNestedTreeList(courseId) {
    return request({
      url: `/admin/edu/chapter/nested-list/${courseId}`,
      method: 'get'
    })
  },
  // 删除章节
  removeById(id) {
    return request({
      url: `/admin/edu/chapter/remove/${id}`,
      method: 'delete'
    })
  },
  // 保存章节信息
  save(chapter) {
    return request({
      url: '/admin/edu/chapter/save',
      method: 'post',
      data: chapter
    })
  },
  // 根据章节id获得章节信息
  getById(id) {
    return request({
      url: `/admin/edu/chapter/get/${id}`,
      method: 'get'
    })
  },
  // 更新章节信息
  updateById(chapter) {
    return request({
      url: '/admin/edu/chapter/update',
      method: 'put',
      data: chapter
    })
  }
}

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export default {
  components: { ChapterForm, VideoForm }, // 2、注册组件
  data() {
    return {
      chapterList: [] // 章节嵌套列表
    }
  },


  created() {
    this.fetchNodeList()
  },


  methods: {
    // 获取后端章节列表数据
    fetchNodeList() {
      chapterApi.getNestedTreeList(this.$parent.courseId).then(response => {
        this.chapterList = response.data.items
      })
    },
    // 根据id删除章节信息
    removeChapterById(chapterId) {
      this.$confirm('此操作将永久删除该章节，是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        return chapterApi.removeById(chapterId)
      }).then(response => {
        this.fetchNodeList()
        this.$message.success(response.message)
      }).catch((response) => {
        if (response === 'cancel') {
          this.$message.info('取消删除')
        }
      })
    },


    // 添加章节
    addChapter() {
      this.$refs.chapterForm.open()
    },


    // 编辑章节
    editChapter(chapterId) {
      this.$refs.chapterForm.open(chapterId)
    },
}

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   <!-- 章节列表 -->
    <!-- 添加章节按钮 -->
    <div>
      <el-button type="primary" @click="addChapter()">添加章节</el-button>
    </div>


    <!-- 章节列表 -->
    <ul class="chapterList">
      <li v-for="chapter in chapterList" :key="chapter.id">
        <p>{{ chapter.title }}
          <span class="acts">
            <el-button type="text" @click="addVideo(chapter.id)">添加课时</el-button>
            <el-button type="text" @click="editChapter(chapter.id)">编辑</el-button>
            <el-button type="text" @click="removeChapterById(chapter.id)">删除</el-button>
          </span>
        </p>
        <ul class="chapterList videoList">
          <li v-for="video in chapter.children" :key="video.id">
            <p>{{ video.title }}
              <el-tag v-if="!video.videoSourceId" size="mini" type="danger">
                {{ '尚未上传视频' }}
              </el-tag>
              <span class="acts">
                <el-tag v-if="video.free" size="mini" type="success">{{ '免费观看' }}</el-tag>
                <el-button type="text" @click="editVideo(chapter.id, video.id)">编辑</el-button>
                <el-button type="text" @click="removeVideoById(video.id)">删除</el-button>
              </span>
            </p>
          </li>
        </ul>
      </li>
    </ul>

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.chapterList{
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
}
.chapterList li{
  position: relative;
}
.chapterList p{
  float: left;
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 1px solid #DDD;
}
.chapterList .acts {
    float: right;
    font-size: 14px;
}