硅谷课堂 08_点播管理模块

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硅谷课堂第八天-点播管理模块（二）

一、发布课程-创建课程大纲

1、课程章节接口

实现课程章节的列表、添加、修改和删除功能

1.1、编写章节Controller

@RestController
@RequestMapping(value="/admin/vod/chapter")
@CrossOrigin
public class ChapterController {

    @Autowired
    private ChapterService chapterService;

    //获取章节小结列表
    @ApiOperation("嵌套章节数据列表")
    @GetMapping("getNestedTreeList/{courseId}")
    public Result getNestedTreeList(
            @ApiParam(value = "课程ID", required = true)
            @PathVariable Long courseId){

        List<ChapterVo> chapterVoList = chapterService.getNestedTreeList(courseId);
        return Result.ok(chapterVoList);
    }

    //2 添加章节
    @PostMapping("save")
    public Result save(@RequestBody Chapter chapter) {
        chapterService.save(chapter);
        return Result.ok(null);
    }

    //3 修改-根据id查询
    @GetMapping("get/{id}")
    public Result get(@PathVariable Long id) {
        Chapter chapter = chapterService.getById(id);
        return Result.ok(chapter);
    }

    //4 修改-最终实现
    @PostMapping("update")
    public Result update(@RequestBody Chapter chapter) {
        chapterService.updateById(chapter);
        return Result.ok(null);
    }

    //5 删除章节
    @DeleteMapping("remove/{id}")
    public Result remove(@PathVariable Long id) {
        chapterService.removeById(id);
        return Result.ok(null);
    }
}
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1.2、编写章节Service

（1）ChapterService

public interface ChapterService extends IService<Chapter> {
    //章节小结列表
    List<ChapterVo> getNestedTreeList(Long courseId);
}
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（2）ChapterServiceImpl

@Service
public class ChapterServiceImpl extends ServiceImpl<ChapterMapper, Chapter> implements ChapterService {

    @Autowired
    private VideoService videoService;

    //章节小结列表封装
    @Override
    public List<ChapterVo> getNestedTreeList(Long courseId) {
        List<ChapterVo> chapterVoList = new ArrayList<>();

        //获取章信息
        LambdaQueryWrapper<Chapter> queryWrapperChapter = new LambdaQueryWrapper<>();
        queryWrapperChapter.eq(Chapter::getCourseId, courseId);
        queryWrapperChapter.orderByAsc(Chapter::getSort, Chapter::getId);
        List<Chapter> chapterList = baseMapper.selectList(queryWrapperChapter);

        //获取课时信息
        LambdaQueryWrapper<Video> queryWrapperVideo = new LambdaQueryWrapper<>();
        queryWrapperVideo.eq(Video::getCourseId, courseId);
        queryWrapperVideo.orderByAsc(Video::getSort, Video::getId);
        List<Video> videoList = videoService.list(queryWrapperVideo);

        //填充列表数据：Chapter列表
        for (int i = 0; i < chapterList.size(); i++) {
            Chapter chapter = chapterList.get(i);

            //创建ChapterVo对象
            ChapterVo chapterVo = new ChapterVo();
            BeanUtils.copyProperties(chapter, chapterVo);
            chapterVoList.add(chapterVo);

            //填充列表数据：Video列表
            List<VideoVo> videoVoList = new ArrayList<>();
            for (int j = 0; j < videoList.size(); j++) {
                Video video = videoList.get(j);
                if(chapter.getId().equals(video.getChapterId())){

                    VideoVo videoVo = new VideoVo();
                    BeanUtils.copyProperties(video, videoVo);
                    videoVoList.add(videoVo);
                }
            }
            chapterVo.setChildren(videoVoList);
        }
        return chapterVoList;
    }
}
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2、课程小节接口

2.1、编写VideoController

@Api(tags = "课程小结（课时）")
@RestController
@RequestMapping(value="/admin/vod/video")
@CrossOrigin
public class VideoController {

    @Autowired
    private VideoService videoService;

    @ApiOperation(value = "获取")
    @GetMapping("get/{id}")
    public Result get(@PathVariable Long id) {
        Video video = videoService.getById(id);
        return Result.ok(video);
    }

    @ApiOperation(value = "新增")
    @PostMapping("save")
    public Result save(@RequestBody Video video) {
        videoService.save(video);
        return Result.ok(null);
    }

    @ApiOperation(value = "修改")
    @PutMapping("update")
    public Result updateById(@RequestBody Video video) {
        videoService.updateById(video);
        return Result.ok(null);
    }

    @ApiOperation(value = "删除")
    @DeleteMapping("remove/{id}")
    public Result remove(@PathVariable Long id) {
        videoService.removeById(id);
        return Result.ok(null);
    }
}
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3、课程大纲前端

3.1、定义接口

（1）chapter.js

import request from '@/utils/request'

const api_name = '/admin/vod/chapter'

export default {

  getNestedTreeList(courseId) {
    return request({
      url: `${api_name}/getNestedTreeList/${courseId}`,
      method: 'get'
    })
  },

  removeById(id) {
    return request({
      url: `${api_name}/remove/${id}`,
      method: 'delete'
    })
  },

  save(chapter) {
    return request({
      url: `${api_name}/save`,
      method: 'post',
      data: chapter
    })
  },

  getById(id) {
    return request({
      url: `${api_name}/get/${id}`,
      method: 'get'
    })
  },

  updateById(chapter) {
    return request({
      url: `${api_name}/update`,
      method: 'put',
      data: chapter
    })
  }
}
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（2）创建video.js

import request from '@/utils/request'

const api_name = '/admin/vod/video'

export default {

  save(video) {
    return request({
      url: `${api_name}/save`,
      method: 'post',
      data: video
    })
  },

  getById(id) {
    return request({
      url: `${api_name}/get/${id}`,
      method: 'get'
    })
  },

  updateById(video) {
    return request({
      url: `${api_name}/update`,
      method: 'put',
      data: video
    })
  },

  removeById(id) {
    return request({
      url: `${api_name}/remove/${id}`,
      method: 'delete'
    })
  }
}
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3.2、编写章节页面

（1）Chapter -> index.vue

<template>
  <div class="app-container">

    <!-- 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>
        <!-- 视频 -->
        <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.isFree" 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>
    <!-- 章节表单对话框 -->
    <chapter-form ref="chapterForm" />
    <!-- 课时表单对话框 -->
    <video-form ref="videoForm" />
    <div style="text-align:center">
      <el-button type="primary" @click="prev()">上一步</el-button>
      <el-button type="primary" @click="next()">下一步</el-button>
    </div>
  </div>
</template>
<script>
import chapterApi from '@/api/vod/chapter'
import videoApi from '@/api/vod/video'

// 引入组件
import ChapterForm from '@/views/vod/course/components/Chapter/Form'
import VideoForm from '@/views/vod/course/components/Video/Form'

export default {
  // 注册组件
  components: { ChapterForm, VideoForm },
  data() {
    return {
      chapterList: [] // 章节嵌套列表
    }
  },
  created() {
    this.fetchNodeList()
  },
  methods: {
    // 获取章节小节数据
    fetchNodeList() {
      chapterApi.getNestedTreeList(this.$parent.courseId).then(response => {
        this.chapterList = response.data
      })
    },
    //删除章节
    removeChapterById(chapterId) {
      this.$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)
    },
    // 添加课时
    addVideo(chapterId) {
      this.$refs.videoForm.open(chapterId)
    },
    // 编辑课时
    editVideo(chapterId, videoId) {
      this.$refs.videoForm.open(chapterId, videoId)
    },
    // 删除课时
    removeVideoById(videoId) {
      this.$confirm('此操作将永久删除该课时, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        return videoApi.removeById(videoId)
      }).then(response => {
        this.fetchNodeList()
        this.$message.success(response.message)
      }).catch((response) => {
        if (response === 'cancel') {
          this.$message.info('取消删除')
        }
      })
    },
    // 上一步
    prev() {
      this.$parent.active = 0
    },
    // 下一步
    next() {
      this.$parent.active = 2
    }
  }
}
</script>
<style scoped>
.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;
}

.videoList{
  padding-left: 50px;
}
.videoList p{
  float: left;
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dashed #DDD;
}
</style>
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（2）Chapter -> Form.vue

<template>
  <!-- 添加和修改章节表单 -->
  <el-dialog :visible="dialogVisible" title="添加章节" @close="close()">
    <el-form :model="chapter" label-width="120px">
      <el-form-item label="章节标题">
        <el-input v-model="chapter.title"/>
      </el-form-item>
      <el-form-item label="章节排序">
        <el-input-number v-model="chapter.sort" :min="0"/>
      </el-form-item>
    </el-form>
    <div slot="footer" class="dialog-footer">
      <el-button @click="close()">取 消</el-button>
      <el-button type="primary" @click="saveOrUpdate()">确 定</el-button>
    </div>
  </el-dialog>
</template>

<script>
import chapterApi from '@/api/vod/chapter'
export default {

  data() {
    return {
      dialogVisible: false,
      chapter: {
        sort: 0
      }
    }
  },
  methods: {
    open(chapterId) {
      this.dialogVisible = true
      if (chapterId) {
        chapterApi.getById(chapterId).then(response => {
          this.chapter = response.data.item
        })
      }
    },

    close() {
      this.dialogVisible = false
      // 重置表单
      this.resetForm()
    },

    resetForm() {
      this.chapter = {
        sort: 0
      }
    },

    saveOrUpdate() {
      if (!this.chapter.id) {
        this.save()
      } else {
        this.update()
      }
    },

    save() {
      this.chapter.courseId = this.$parent.$parent.courseId
      chapterApi.save(this.chapter).then(response => {
        this.$message.success(response.message)
        // 关闭组件
        this.close()
        // 刷新列表
        this.$parent.fetchNodeList()
      })
    },

    update() {
      chapterApi.updateById(this.chapter).then(response => {
        this.$message.success(response.message)
        // 关闭组件
        this.close()
        // 刷新列表
        this.$parent.fetchNodeList()
      })
    }
  }
}
</script>
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3.3、编写小节（课时）页面

[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-WeXqpOHF-1665476597752)(.\images\image-20220226095044141.png)]

（1）Video -> Form.vue

<template>
  <!-- 添加和修改课时表单 -->
  <el-dialog :visible="dialogVisible" title="添加课时" @close="close()">
    <el-form :model="video" label-width="120px">
      <el-form-item label="课时标题">
        <el-input v-model="video.title"/>
      </el-form-item>
      <el-form-item label="课时排序">
        <el-input-number v-model="video.sort" :min="0" />
      </el-form-item>
      <el-form-item label="是否免费">
        <el-radio-group v-model="video.isFree">
          <el-radio :label="0">免费</el-radio>
          <el-radio :label="1">默认</el-radio>
        </el-radio-group>
      </el-form-item>

      <!-- 上传视频 -->
      <el-form-item label="上传视频">
        <el-upload
          ref="upload"
          :auto-upload="false"
          :on-success="handleUploadSuccess"
          :on-error="handleUploadError"
          :on-exceed="handleUploadExceed"
          :file-list="fileList"
          :limit="1"
          :before-remove="handleBeforeRemove"
          :on-remove="handleOnRemove"
          :action="BASE_API+'/admin/vod/upload'">
          <el-button slot="trigger" size="small" type="primary">选择视频</el-button>
          <el-button
            :disabled="uploadBtnDisabled"
            style="margin-left: 10px;"
            size="small"
            type="success"
            @click="submitUpload()">上传</el-button>
        </el-upload>
      </el-form-item>
    </el-form>
    <div slot="footer" class="dialog-footer">
      <el-button @click="close()">取 消</el-button>
      <el-button type="primary" @click="saveOrUpdate()">确 定</el-button>
    </div>
  </el-dialog>
</template>

<script>
import videoApi from '@/api/vod/video'
//import vodApi from '@/api/vod/vod'
export default {

  data() {
    return {
      BASE_API: 'http://localhost:8301',
      dialogVisible: false,
      video: {
        sort: 0,
        free: false
      },
      fileList: [], // 上传文件列表
      uploadBtnDisabled: false
    }
  },

  methods: {
    open(chapterId, videoId) {
      this.dialogVisible = true
      this.video.chapterId = chapterId
      if (videoId) {
        videoApi.getById(videoId).then(response => {
          this.video = response.data
          // 回显
          if (this.video.videoOriginalName) {
            this.fileList = [{ 'name': this.video.videoOriginalName }]
          }
        })
      }
    },

    close() {
      this.dialogVisible = false
      // 重置表单
      this.resetForm()
    },

    resetForm() {
      this.video = {
        sort: 0,
        free: false
      }

      this.fileList = [] // 重置视频上传列表
    },

    saveOrUpdate() {
      if (!this.video.id) {
        this.save()
      } else {
        this.update()
      }
    },

    save() {
      this.video.courseId = this.$parent.$parent.courseId
      videoApi.save(this.video).then(response => {
        this.$message.success(response.message)
        // 关闭组件
        this.close()
        // 刷新列表
        this.$parent.fetchNodeList()
      })
    },

    update() {
      videoApi.updateById(this.video).then(response => {
        this.$message.success(response.message)
        // 关闭组件
        this.close()
        // 刷新列表
        this.$parent.fetchNodeList()
      })
    },

    // 上传多于一个视频
    handleUploadExceed(files, fileList) {
      this.$message.warning('想要重新上传视频，请先删除已上传的视频')
    },

    // 上传
    submitUpload() {
      this.uploadBtnDisabled = true
      this.$refs.upload.submit() // 提交上传请求
    },

    // 视频上传成功的回调
    handleUploadSuccess(response, file, fileList) {
      this.uploadBtnDisabled = false
      this.video.videoSourceId = response.data
      this.video.videoOriginalName = file.name
    },

    // 失败回调
    handleUploadError() {
      this.uploadBtnDisabled = false
      this.$message.error('上传失败2')
    },

    // 删除视频文件确认
    handleBeforeRemove(file, fileList) {
      return this.$confirm(`确定移除 ${file.name}？`)
    },

    // 执行视频文件的删除
    handleOnRemove(file, fileList) {
      if (!this.video.videoSourceId) {
        return
      }
    }
  }
}
</script>
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二、发布课程-课程最终发布

1、课程最终发布接口

1.1、编写CourseController

添加方法

    @ApiOperation("根据id获取课程发布信息")
    @GetMapping("getCoursePublishVo/{id}")
    public Result getCoursePublishVoById(
            @ApiParam(value = "课程ID", required = true)
            @PathVariable Long id){

        CoursePublishVo coursePublishVo = courseService.getCoursePublishVo(id);
        return Result.ok(coursePublishVo);
    }

    @ApiOperation("根据id发布课程")
    @PutMapping("publishCourseById/{id}")
    public Result publishCourseById(
            @ApiParam(value = "课程ID", required = true)
            @PathVariable Long id){

        boolean result = courseService.publishCourseById(id);
        return Result.ok();
    }
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1.2、编写CourseService

//根据id获取课程发布信息    
CoursePublishVo getCoursePublishVo(Long id);

//根据id发布课程
boolean publishCourseById(Long id);
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1.3、编写CourseServiceImpl

//根据id获取课程发布信息 
@Override
public CoursePublishVo getCoursePublishVo(Long id) {
	return courseMapper.selectCoursePublishVoById(id);
}

//根据id发布课程
@Override
public boolean publishCourseById(Long id) {
	Course course = new Course();
	course.setId(id);
	course.setPublishTime(new Date());
	course.setStatus(1);
	return this.updateById(course);
}
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1.4、编写CourseMapper

public interface CourseMapper extends BaseMapper<Course> {
	//根据id获取课程发布信息 
    CoursePublishVo selectCoursePublishVoById(Long id);
}
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1.5、编写CourseMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.atguigu.ggkt.vod.mapper.CourseMapper">

    <select id="selectCoursePublishVoById" resultType="com.atguigu.ggkt.vo.vod.CoursePublishVo">
        SELECT
                c.id,
                c.title,
                c.cover,
                c.lesson_num AS lessonNum,
                c.price,
                t.name AS teacherName,
                s1.title AS subjectParentTitle,
                s2.title AS subjectTitle
        FROM course c
             LEFT OUTER JOIN teacher t ON c.teacher_id=t.id
             LEFT OUTER JOIN `subject` s1 ON c.subject_parent_id=s1.id
             LEFT OUTER JOIN `subject` s2 ON c.subject_id=s2.id
        WHERE c.id=#{id}
    </select>
</mapper>
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1.6、添加配置

（1）application.properties添加

mybatis-plus.mapper-locations=classpath:com/atguigu/ggkt/vod/mapper/xml/*.xml
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（2）service模块pom.xml添加

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
    <resources>
        <resource>
            <directory>src/main/java</directory>
            <includes>
                <include>**/*.yml</include>
                <include>**/*.properties</include>
                <include>**/*.xml</include>
            </includes>
            <filtering>false</filtering>
        </resource>
        <resource>
            <directory>src/main/resources</directory>
            <includes> <include>**/*.yml</include>
                <include>**/*.properties</include>
                <include>**/*.xml</include>
            </includes>
            <filtering>false</filtering>
        </resource>
    </resources>
</build>
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2、课程最终发布前端

2.1、course.js定义接口

//获取发布课程信息  
getCoursePublishById(id) {
   return request({
     url: `${api_name}/getCoursePublishVo/${id}`,
     method: 'get'
   })
},
//发布课程  
publishCourseById(id) {
   return request({
     url: `${api_name}/publishCourseById/${id}`,
     method: 'put'
   })
},
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2.2、编写Publish.vue

<template>
  <div class="app-container">
    <!--课程预览-->
    <div class="ccInfo">
      <img :src="coursePublish.cover">
      <div class="main">
        <h2>{{ coursePublish.title }}</h2>
        <p class="gray"><span>共{{ coursePublish.lessonNum }}课时</span></p>
        <p><span>所属分类：{{ coursePublish.subjectParentTitle }} — {{ coursePublish.subjectTitle }}</span></p>
        <p>课程讲师：{{ coursePublish.teacherName }}</p>
        <h3 class="red">￥{{ coursePublish.price }}</h3>
      </div>
    </div>
    <div style="text-align:center">
      <el-button type="primary" @click="prev()">上一步</el-button>
      <el-button :disabled="publishBtnDisabled" type="primary" @click="publish()">发布课程</el-button>
    </div>
  </div>
</template>

<script>
import courseApi from '@/api/vod/course'

export default {
  data() {
    return {
      publishBtnDisabled: false, // 按钮是否禁用
      coursePublish: {}
    }
  },
  created() {
    if (this.$parent.courseId) {
      this.fetchCoursePublishById(this.$parent.courseId)
    }
  },
  methods: {
    // 获取课程发布信息
    fetchCoursePublishById(id) {
      courseApi.getCoursePublishById(id).then(response => {
        this.coursePublish = response.data
      })
    },
    // 上一步
    prev() {
      this.$parent.active = 1
    },
    // 下一步
    publish() {
      this.publishBtnDisabled = true
      courseApi.publishCourseById(this.$parent.courseId).then(response => {
        this.$parent.active = 3
        this.$message.success(response.message)
        this.$router.push({ path: '/vodcourse/course/list' })
      })
    }
  }
}
</script>
<style scoped>
.ccInfo {
    background: #f5f5f5;
    padding: 20px;
    overflow: hidden;
    border: 1px dashed #DDD;
    margin-bottom: 40px;
    position: relative;
}
.ccInfo img {
    background: #d6d6d6;
    width: 500px;
    height: 278px;
    display: block;
    float: left;
    border: none;
}
.ccInfo .main {
    margin-left: 520px;
}
.ccInfo .main h2 {
    font-size: 28px;
    margin-bottom: 30px;
    line-height: 1;
    font-weight: normal;
}
.ccInfo .main p {
    margin-bottom: 10px;
    word-wrap: break-word;
    line-height: 24px;
    max-height: 48px;
    overflow: hidden;
}
.ccInfo .main p {
    margin-bottom: 10px;
    word-wrap: break-word;
    line-height: 24px;
    max-height: 48px;
    overflow: hidden;
}
.ccInfo .main h3 {
    left: 540px;
    bottom: 20px;
    line-height: 1;
    font-size: 28px;
    color: #d32f24;
    font-weight: normal;
    position: absolute;
}
</style>
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三、功能实现-课程删除

1、课程删除接口

（1）编写课程Controller

@ApiOperation(value = "删除课程")
@DeleteMapping("remove/{id}")
public Result remove(@PathVariable Long id) {
    courseService.removeCourseById(id);
    return Result.ok();
}
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（2）编写课程Service

    //删除课程
    @Override
    public void removeCourseById(Long id) {
        //根据课程id删除小节
        videoService.removeVideoByCourseId(id);
        //根据课程id删除章节
        chapterService.removeChapterByCourseId(id);
        //根据课程id删除描述
        descriptionService.removeById(id);
        //根据课程id删除课程
        baseMapper.deleteById(id);
    }
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（3）编写VideoService

@Service
public class VideoServiceImpl extends ServiceImpl<VideoMapper, Video> implements VideoService {

    //根据课程id删除小节
    @Override
    public void removeVideoByCourseId(Long id) {
        QueryWrapper<Video> wrapper = new QueryWrapper<>();
        wrapper.eq("course_id",id);
        baseMapper.delete(wrapper);
    }
}
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（4）编写ChapterService

   //根据课程id删除章节
    @Override
    public void removeChapterByCourseId(Long id) {
        QueryWrapper<Chapter> wrapper = new QueryWrapper<>();
        wrapper.eq("course_id",id);
        baseMapper.delete(wrapper);
    }
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2、课程删除前端

2.1、course.js定义接口

  removeById(id) {
    return request({
      url: `${api_name}/remove/${id}`,
      method: 'delete'
    })
  },
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2.2、course -> list.vue添加方法

methods: {
	......
	// 根据id删除数据
    removeById(id) {
      this.$confirm('此操作将永久删除该课程，以及该课程下的章节和视频，是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        return courseApi.removeById(id)
      }).then(response => {
        this.fetchData()
        this.$message.success(response.message)
      }).catch((response) => { // 失败
        if (response === 'cancel') {
          this.$message.info('取消删除')
        }
      })
    }
}
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