1、api中新建course.js

import request from '@/utils/request'

export default {
  //课程分页条件查询
  getCourseList(page,limit,courseQuery){
      return request({
          url: `/eduservice/coursefront/getCourseList/${page}/${limit}`,
          method: 'post',
          data: courseQuery
      })
  },
  //分类查询
  getAllSubject(){
    return request({
        url: `/eduservice/edu-subject/getAllSubject`,
        method: 'get',
    })
},

2、页面代码和方法

<template>
  <div id="aCoursesList" class="bg-fa of">
    <!-- /课程列表 开始 -->
    <section class="container">
      <header class="comm-title">
        <h2 class="fl tac">
          <span class="c-333">全部课程</span>
        </h2>
      </header>
      <section class="c-sort-box">
        <section class="c-s-dl">
          <dl>
            <dt>
              <span class="c-999 fsize14">课程类别</span>
            </dt>
            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li>
          <a title="全部" href="javascript:void(0);" @click="searchOne('')" >全部</a>
        </li>
        <li v-for="(item,index) in subjectNestedList" v-bind:key="index" :class="{active:oneIndex==index}">
          <a :title="item.title" href="javascript:void(0);" @click="searchOne(item.id, index)">{{item.title}}</a>
        </li>

              </ul>
            </dd>
          </dl>
          <dl>
            <dt>
              <span class="c-999 fsize14"></span>
            </dt>
            <dd class="c-s-dl-li">
              <ul class="clearfix">
                <li v-for="(items,index) in subSubjectList" :key="index">
                  <a title="items.title" href="#" @click="searchTwo(items.id, index)">{{items.title}}</a>
                </li>
              </ul>
            </dd>
          </dl>
          <div class="clear"></div>
        </section>
        <div class="js-wrap">
          <section class="fr">
            <span class="c-ccc">
              <i class="c-master f-fM">1</i>/
              <i class="c-666 f-fM">1</i>
            </span>
          </section>
          <section class="fl">
  <ol class="js-tap clearfix">
    <li :class="{'current bg-orange':buyCountSort!=''}">
      <a title="销量" href="javascript:void(0);" @click="searchBuyCount()">销量
      <span :class="{hide:buyCountSort==''}">↓</span>
      </a>
    </li>
    <li :class="{'current bg-orange':gmtCreateSort!=''}">
      <a title="最新" href="javascript:void(0);" @click="searchGmtCreate()">最新
      <span :class="{hide:gmtCreateSort==''}">↓</span>
      </a>
    </li>
    <li :class="{'current bg-orange':priceSort!=''}">
      <a title="价格" href="javascript:void(0);" @click="searchPrice()">价格&nbsp;
        <span :class="{hide:priceSort==''}">↓</span>
      </a>
    </li>
  </ol>
</section>
        </div>
        <div class="mt40">
          <!-- /无数据提示 开始-->
          <section class="no-data-wrap" v-if="data.total==0">
            <em class="icon30 no-data-ico">&nbsp;</em>
            <span class="c-666 fsize14 ml10 vam">没有相关数据，小编正在努力整理中...</span>
          </section>
          <!-- /无数据提示 结束-->
          <!-- 数据列表 开始-->
<article v-if="data.total>0" class="comm-course-list">
    <ul id="bna" class="of">
        <li v-for="item in data.items" :key="item.id">
            <div class="cc-l-wrap">
                <section class="course-img">
                    <img :src="item.cover" class="img-responsive" alt="听力口语">
                    <div class="cc-mask">
                        <a :href="'/course/'+item.id" title="开始学习" class="comm-btn c-btn-1">开始学习</a>
                    </div>
                </section>
                <h3 class="hLh30 txtOf mt10">
                    <a :href="'/course/'+item.id" :title="item.title" class="course-title fsize18 c-333">{{ item.title }}</a>
                </h3>
                <section class="mt10 hLh20 of">
                    <span v-if="Number(item.price) === 0" class="fr jgTag bg-green">
                        <i class="c-fff fsize12 f-fA">免费</i>
                    </span>
                    <span class="fl jgAttr c-ccc f-fA">
                        <i class="c-999 f-fA">{{ item.viewCount }}人学习</i>
                        |
                        <i class="c-999 f-fA">9634评论</i>
                    </span>
                </section>
            </div>
        </li>
    </ul>
    <div class="clear"/>
</article>
        </div>
        <!-- 公共分页 开始 -->
        <div>
  <div class="paging">
    <!-- undisable这个class是否存在，取决于数据属性hasPrevious -->
    <a
      :class="{undisable: !data.hasPrevious}"
      href="#"
      title="首页"
      @click.prevent="gotoPage(1)">首</a>
    <a
      :class="{undisable: !data.hasPrevious}"
      href="#"
      title="前一页"
      @click.prevent="gotoPage(data.current-1)">&lt;</a>
    <a
      v-for="page in data.pages"
      :key="page"
      :class="{current: data.current == page, undisable: data.current == page}"
      :title="'第'+page+'页'"
      href="#"
      @click.prevent="gotoPage(page)">{{ page }}</a>
    <a
      :class="{undisable: !data.hasNext}"
      href="#"
      title="后一页"
      @click.prevent="gotoPage(data.current+1)">&gt;</a>
    <a
      :class="{undisable: !data.hasNext}"
      href="#"
      title="末页"
      @click.prevent="gotoPage(data.pages)">末</a>
    <div class="clear"/>
  </div>
</div>
        <!-- 公共分页 结束 -->
      </section>
    </section>
    <!-- /课程列表 结束 -->
  </div>
</template>
<script>
import course from '@/api/course'

export default {
  data() {
    return {
      page:1,
      data:{},
      subjectNestedList: [], // 一级分类列表
      subSubjectList: [], // 二级分类列表
      searchObj: {}, // 查询表单对象
      oneIndex:-1,
      twoIndex:-1,
      buyCountSort:"",
      gmtCreateSort:"",
      priceSort:""
    }
  },
  created() {
      //获取课程列表
    this.initCourse()
    //获取分类
    this.initSubject()
  },
  methods: {
    //查询课程列表
    initCourse(){
      course.getCourseList(1, 4,this.searchObj).then(response => {
        this.data = response.data.data
      })
    },
    //查询所有分类
    initSubject(){
      //debugger
      course.getAllSubject().then(response => {
        this.subjectNestedList = response.data.data.items
      })
    },
    
    //点击一级分类，显示对应的二级分类，查询数据
    searchOne(subjectParentId, index) {
      //debugger
      this.oneIndex = index
      this.twoIndex = -1
      this.searchObj.subjectId = "";
      this.subSubjectList = [];
      this.searchObj.subjectParentId = subjectParentId;
      this.gotoPage(this.page)
      for (let i = 0; i < this.subjectNestedList.length; i++) {
        if (this.subjectNestedList[i].id === subjectParentId) {
          this.subSubjectList = this.subjectNestedList[i].children
        }
      }
    },
    //点击二级分类，查询数据
    searchTwo(subjectId, index) {
      this.twoIndex = index
      this.searchObj.subjectId = subjectId;
      this.gotoPage(this.page)
    },
    //购买量查询
    searchBuyCount() {
      this.buyCountSort = "1";
      this.gmtCreateSort = "";
      this.priceSort = "";
      this.searchObj.buyCountSort = this.buyCountSort;
      this.searchObj.gmtCreateSort = this.gmtCreateSort;
      this.searchObj.priceSort = this.priceSort;
      this.gotoPage(this.page)
    },
     //更新时间查询
    searchGmtCreate() {
      this.buyCountSort = "";
      this.gmtCreateSort = "1";
      this.priceSort = "";
      this.searchObj.buyCountSort = this.buyCountSort;
      this.searchObj.gmtCreateSort = this.gmtCreateSort;
      this.searchObj.priceSort = this.priceSort;
      this.gotoPage(this.page)
    },
    //价格查询
    searchPrice() {
      this.buyCountSort = "";
      this.gmtCreateSort = "";
      this.priceSort = "1";
      this.searchObj.buyCountSort = this.buyCountSort;
      this.searchObj.gmtCreateSort = this.gmtCreateSort;
      this.searchObj.priceSort = this.priceSort;
      this.gotoPage(this.page)
    },
    //分页查询
    gotoPage(page) {
      this.page = page
      course.getCourseList(page, 4, this.searchObj).then(response => {
        this.data = response.data.data
      })
    }

  }
    

};
</script>
<style scoped>
  .active {
    background: #bdbdbd;
  }
  .hide {
    display: none;
  }
  .show {
    display: block;
  }
</style>

3、总结

1.筛选

其实这个筛选，就是在前端定义所有的查询条件，

后端

 

前端：

 

 

 每次传都是我们的searchObj这个对象，后端判断如果有值就进行对应的查询。

就随便拿一个销量排序来说，我们把bucountsort这个值设为1，说明我们要对销量进行排序，如果后端检测到这个字段有值，那么就会进行倒序排序

 

 

2、一级二级分类显示

其实我们拿到的数据就是一级菜单包含二级菜单

一级菜单直接拿tiltle即可，二级菜单需要做一个遍历