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0. 整体代码：

【效果】：



【栗子代码】：

<template>
  <div>
    <el-table @cell-mouse-enter="hoverDate" :row-class-name="tableRowClassName" :data="tableData">
      <el-table-column align="center" label="序号">
        <template v-slot="scope">
          <div :title="scope.row.index+1" v-html="scope.row.index+1" class="title-tips"></div>
        </template>
      </el-table-column>
      <el-table-column prop="keyName" label="名称" min-width="200">
        <template v-slot="scope">
          <div :title="scope.row.keyName" v-html="scope.row.keyName" class="title-tips"></div>
        </template>
      </el-table-column>
      <el-table-column prop="valueByte" label="值" min-width="350">
        <template v-slot="scope">
          <div :id="'valueByte'.concat(scope.$index)" v-html="scope.row.valueByte" class="title-tips"></div>
        </template>
      </el-table-column>
      <el-table-column prop="desc" label="描述" min-width="150">
        <template v-slot="scope">
          <div :id="'desc'.concat(scope.$index)" v-html="scope.row.desc" class="title-tips"></div>
        </template>
      </el-table-column>
      <el-table-column prop="userId" label="最后更新人" min-width="100">
        <template v-slot="scope">
          <div :title="scope.row.userId" v-html="scope.row.userId" class="title-tips"></div>
        </template>
      </el-table-column>
      <el-table-column prop="cTime" label="最后更新时间" min-width="120">
        <template v-slot="scope">
          <div :id="'cTime'.concat(scope.$index)" v-html="scope.row.cTime" class="title-tips"></div>
        </template>
      </el-table-column>
    </el-table>
  </div>
</template>

<script>
export default {
  name: "SideOne",
  methods: {
    // 将行索引设置到row里面
    tableRowClassName ({ row, rowIndex }) {
      row.index = rowIndex
    },
    // 鼠标悬浮显示title
    hoverDate: function (row, column) {
      let id
      if (column.property === "cTime") {
        id = "cTime".concat(row.index)
      } else if (column.property === "valueByte") {
        id = "valueByte".concat(row.index)
      } else if (column.property === "desc") {
        id = "desc".concat(row.index)
      } else {
        return
      }

      let titleVule = document.getElementById(id).textContent
      if (typeof titleVule === 'undefined' || titleVule === null) {
        titleVule = ""
      }
      document.getElementById(id).setAttribute("title", titleVule)
    }
  },
  data: function () {
    return {
      tableData: [
        {
          keyName: "com.test.keyname",
          valueByte: "&lt;noscript&gt;&#xa;&lt;strong&gt;We&#x27;re sorry but vue dosen&#x27;t work &lt;&#x2f;strong&gt;",
          desc: "&lt;div&gt;desc&lt;&#x2f;div&gt;",
          userId: "zhangsan",
          cTime: "2021-08-21&#x3a;22&#x3a;22&#x3a;22"
        }
      ]
    }
  }
}
</script>

<style scoped>
.title-tips {
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
}
</style>

1. html代码反显：

el-table-column中html代码片段反显，可以使用template+ v-html指令来实现，如：

<el-table-column prop="desc" label="描述" min-width="150">
  <template v-slot="scope">
    <div :id="'desc'.concat(scope.$index)" v-html="scope.row.desc" class="title-tips"></div>
  </template>
</el-table-column>

2. title显示：

el-table-column可以使用:show-overflow-tooltip=”true”来进行单元格内容超长title显示，如：

    <el-table-column prop="desc" label="描述" min-width="150" :show-overflow-tooltip="true">
        <template v-slot="scope">
          <div v-html="scope.row.desc" class="title-tips"></div>
        </template>
      </el-table-column>

但这只对内容超长时才显示，要想不分内容长短都title显示，就想到document中的title属性

·

所以栗子代码中使用document来动态设置title属性，要点如下：

• 通过:row-class-name=”tableRowClassName”将行索引设置到row里面
• 通过 :id=”‘valueByte’.concat(scope.$index)”与行索引构成动态绑定id
• 通过@cell-mouse-enter=“hoverDate” 鼠标进入单元格，触发方法动态绑定，通过id来设置title属性

    // 鼠标悬浮显示title
    hoverDate: function (row, column) {
      let id
      if (column.property === "cTime") {
        id = "cTime".concat(row.index)
      } else if (column.property === "valueByte") {
        id = "valueByte".concat(row.index)
      } else if (column.property === "desc") {
        id = "desc".concat(row.index)
      } else {
        return
      }

      let titleVule = document.getElementById(id).textContent
      if (typeof titleVule === 'undefined' || titleVule === null) {
        titleVule = ""
      }
      document.getElementById(id).setAttribute("title", titleVule)
    }

3. 内容超长打点：

单元格内容超长时，使用…显示，只要设置如下css样式：

.title-tips {
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
}