// 分页
exports.pageQuery = function (page, pageSize, Model, populate, queryParams, projection, sortParams, callback) {
 var start = (page - 1) * pageSize; // 根据 page 和 pageSize 得到 skip 要跳过的记录量
 var $page = {
  pageNumber: page
 };
 async.parallel({
  count: function (done) { // 查询到总共有count条数据
   Model.count(queryParams).exec(function (err, count) {
    done(err, count);
   });
  },
  records: function (done) { // 查询得到排序和排除字段的记录
   Model.find(queryParams, projection).skip(start).limit(pageSize).populate(populate).sort(sortParams).exec(function (err, doc) {
    done(err, doc);
   });
  }
 }, function (err, results) {

  var list = new Array();
  for (let item of results.records) {
   list.push(item.toObject())
  }

  var count = results.count;
  $page.pageCount = parseInt((count - 1) / pageSize + 1); // 总页数
  $page.results = list; // 单页结果
  $page.count = count; // 总记录量
  callback(err, $page);
 });
};

// 数据库命令，就是个正则表达式： / 参数 /
db.getCollection('jobs').find({company: /网易/})

// js里如果直接写 /data.company/会是个字符串，Model.find({})函数识别不了，只能用 new RegExp()
company: new RegExp(data.company)

// 查询工作
exports.findJobs = function (data, cb) {
 let searchItem = {
  company: new RegExp(data.company),
  type: new RegExp(data.type),
  money: { $gte: data.salaryMin, $lte: data.salaryMax }
 }
 for (let item in searchItem) { // 若条件为空则删除该属性
  if (searchItem[item] === '//') {
   delete searchItem[item]
  }
 }
 var page = data.page || 1
 this.pageQuery(page, PAGE_SIZE, Job, '', searchItem, {_id: 0, __v: 0}, {
  money: 'asc'
 }, function (error, data) {
  ...
 })
}

// html
<div class="searchResult">
 <table class="table table-hover">
  <tbody class="jobList">
   <tr>
    <th v-for="item in title">{{ item }}</th>
   </tr>
   <tr v-for="(item, index) in searchResults" @click="showDesc(index)">
    <td v-for="value in item">{{ value }}</td>
   </tr>
  </tbody>
 </table>
</div>

// onSubmit()
Axios.post('http://localhost:3000/api/searchJobs', searchData)
.then(res => {
 this.searchResults = res.data.results   // 单页查询结果
 this.page.count = res.data.pageCount   // 总页数
 console.log('总页数' + this.page.count)  // 总数据量
 ...
})
.catch(err => {
 console.log(err)
})

// 父组件中使用 DescMsg
<DescMsg :jobDesc="jobDesc" :showMsg="showMsg" v-on:hideMsg="hideJobDesc"></DescMsg>

// 显示详情框
showDesc (index) {
 let item = this.searchResults[index]
 this.jobDesc = [
  { title: '标题', value: item.posname },
  { title: '公司', value: item.company },
  { title: '月薪', value: item.money },
  { title: '地点', value: item.area },
  { title: '发布时间', value: item.pubdate },
  { title: '最低学历', value: item.edu },
  { title: '工作经验', value: item.exp },
  { title: '详情', value: item.desc },
  { title: '福利', value: item.welfare },
  { title: '职位类别', value: item.type },
  { title: '招聘人数', value: item.count }
 ]
 this.showMsg = true
},
// 关闭详情框
hideJobDesc () {
 this.showMsg = false
}

// 子组件 DescMsg

<template>
 <div class="wrapper" v-if="showMsg">
 <div class="shade" @click="hideShade"></div>
 <div class="msgBox">
  <h4 class="msgTitle">详情介绍</h4>
  <table class="table table-hover">
  <tbody class="jobList">
   <tr v-for="item in jobDesc" :key="item.id">
   <td class="title">{{ item.title }}</td>
   <td class="ctn">{{ item.value }}</td>
   </tr>
  </tbody>
  </table>
  <div class="ft">
  <button type="button" class="btn btn-primary" @click="fllow">关注</button>
  </div>
 </div>
 </div>
</template>

<script>

export default {
 data () {
 return {
 }
 },
 props: {
 jobDesc: {
  type: Array,
  default: []
 },
 showMsg: {
  type: Boolean,
  default: false
 }
 },
 methods: {
 hideShade () {
  this.$emit('hideMsg')
 },
 fllow () {
  alert('1')
 }
 }
}
</script>

<!-- 底部页号栏 -->
<div class="pageButtons">
 <nav aria-label="Page navigation">
  <ul class="pagination">
   <li :class="{disabled: minPage}">
    <a aria-label="Previous">
     <span aria-hidden="true">«</span>
    </a>
   </li>
   <li v-for="(item, index) of pageList" :class="{active: item.active}">
    <a @click="onSubmit(index)">{{ item.value }}</a>
   </li>
   <li :class="{disabled: maxPage}">
    <a aria-label="Next">
     <span aria-hidden="true">»</span>
    </a>
   </li>
  </ul>
 </nav>
</div>

export default {
 data () {
 return {
  page: {
  selected: 0, // 选中页数
  count: 0,  // 总页数
  size: 10  // 最大显示页数
  },
  pageList: [
  {active: false, value: 1} // 默认包含页数1
  ]
 }
 },
 methods: {
  // index 代表从左到开始第index个页号，好吧我也搞混了，最多10个
 onSubmit (index) {
  if (index === -1) { // index为-1代表直接点击查询按钮触发的事件，初始化数据
  index = 0
  this.page.selected = 0
  this.pageList = [
   {active: false, value: 1}
  ]
  }
  Axios.post('http://localhost:3000/api/searchJobs', searchData)
  .then(res => {
  this.page.count = res.data.pageCount // 总页数
  let pageNumber = 1 // 默认第1页

  // 若index >= 6且显示的最后一个页号小于总页数，则整体向后移动1，选中的页号相应向左移动1，即index--
  if (index >= 6 && (this.page.count - this.pageList[9].value) > 0) {
   pageNumber = this.pageList[1].value
   index--
  } else if (index < 6 && this.pageList[0].value !== 1) {
   pageNumber = this.pageList[0].value - 1
   index++
  }
  this.pageList = [] // 初始化 pageList，之后会重新渲染
  this.page.size = (this.page.count > 10) ? 10 : this.page.count
  for (let i = 0; i < this.page.size; i++) {
   let item = {
   active: false,
   value: pageNumber
   }
   pageNumber++
   this.pageList.push(item)
  }
  // 改变当前选中页号下标样式，index 代表从左到开始第index个页号，最多10个
  this.pageList[this.page.selected].active = false
  this.pageList[index].active = true
  this.page.selected = index
  console.log(searchData.page)
  })
  .catch(err => {
  console.log(err)
  })
 }
 }
}