vue中 表头th 合并单元格，且表格列数不定的动态渲染方法

吐槽

今天，在vue中遇到 复杂表格的渲染 ，需要合并表头的单元格，且合并单元格的那列还是动态数据，也就是说你不知道会有多少组要合并起来，哎，我也有点说不清楚，废话不多说了，看代码把：

代码示例

data数据是后端接口返回的，其中的数据格式是这样的：

[
    {
    "studentId": "ff808081651e03d4016530b937f50a33",
    "studentName": "傅xx",
    "studentCode": "91scdsc109",
    "sex": {
      "value": "MALE",
      "name": "男"
    },
    "termName": "2018秋",
    "examDates": [
      "10月",
      "9月28日"
    ],
    "map": {
      "9月28日": [
        {
          "courseName": "听力",
          "scorel": 6.0
        },
        {
          "courseName": "阅读",
          "score": 7.0
        },
        {
          "courseName": "写作",
          "scorel": 5.5
        }
      ]
    },
    "courseNames": [
      "听力",
      "阅读",
      "写作",
      "口语",
      "总分"
    ]
  },
  {
    "studentId": "ff8080816483a43d01648723c52801bc",
    "studentName": "陈xx",
    "studentCode": "91edfedf3",
    "sex": {
      "value": "FEMALE",
      "name": "女"
    },
    "termName": "2018秋",
    "examDates": [
      "10月",
      "9月28日"
    ],
    "map": {
      "9月28日": [
        {
          "courseName": "听力",
          "score": 5.5,
          "order": 0
        },
        {
          "courseName": "阅读",
          "score": 6.0,
          "order": 1
        },
        {
          "courseName": "写作",
          "score": 5.5,
          "order": 2
        },
        {
          "courseName": "口语",
          "scoreFinal": 5.5,
          "order": 3
        }
      ]
    },
    "courseNames": [
      "听力",
      "阅读",
      "写作",
      "口语",
      "总分"
    ]
  }
]

获取到以上数据后，对数据稍微处理下：

<table class="table">
            <thead>
                    <tr>
                        <th rowspan="2">序号</th>
                        <th rowspan="2">姓名</th>
                        <th rowspan="2">学号</th>
                        <th rowspan="2">性别</th>
                        <th rowspan="2">学期</th>
                        <th colspan="5" v-for="(it,i) in examDates" :key="i">{{it}}</th>
                    </tr>
                    <tr>
                        <template v-for="itd in examDates">
                          <th v-for="(itc,j) in courseNames" :key="itd+j">{{itc}}</th>
                        </template>
                    </tr>
            </thead>
            <tbody>
                    <tr v-for="(item,index) in studentDataList" :key="index">
                        <td>{{index+1}}</td>
                        <td>{{item.studentName}}</td>
                        <td>{{item.studentCode}}</td>
                        <td>{{item.sex.name}}</td>
                        <td>{{item.termName}}</td>
                        <template v-for="examDate in examDates">
                          <template  v-for="(course,j) in courseNames">
                            <td :key="examDate+j">
                              {{initScoreFinal(examDate,course,item.map)}}
                            </td>
                          </template>
                        </template>
                    </tr>
            </tbody>
          </table>

----------------   分割线  ---------------------------------------

  data () {
    return {
      studentDataList: [],
      examDates: [],
      courseNames: []
   },
   created () {
     this.getData ()
   },
   methods: {
    //
    getData () {
      this.$get( //该方法是封装过的axios
        '/list.json',
        {
        ....//此处是参数，略
        },
        response => {
          this.examDates = response.data[0].examDates
          courseNames = response.data[0].courseNames
          this.studentDataList = response.data
        }
      )
    },
    initScoreFinal (examDate, course, map) {
      let scoreFinal = 0
      console.log('map:' + map)
      for (var it in map) {
        map[it].forEach((item, index, array) => {
          if (it === examDate && item.courseName === course) {
            scoreFinal = item.scoreFinal
          }
        })
      }
      return scoreFinal
    }
}

效果如图：

再吐个槽

在网上搜了很多合并单元格的都是简单的数据合并，也就是td合并，我们这边的项目需要的这个表格比较变态，按日期分组的去五门课程，且日期数目不定，又可能多个日期，这就很头疼了，总之长知识了，记录下来。

原文地址：https://segmentfault.com/a/1190000016895856