<el-table :data="tableData" style="width: 100%">
   <el-table-column prop="date" label="日期" width="180"></el-table-column>
   <el-table-column prop="name" label="姓名" width="180"></el-table-column>  
</el-table>

<el-table :data="tableData" style="width: 100%">
   <el-table-column label="日期" width="180">
        <template slot-scope="scope">
            <span>{{ scope.row.date | FormatDate('HH:mm:ss') }}</span>
        </template>
   </el-table-column>
   <el-table-column prop="name" label="姓名" width="180"></el-table-column>  
</el-table>

// main.js
function formatDate(date, fmt) {
  date = new Date(date);
  if (typeof(fmt) === "undefined") {
      fmt = "yyyy-MM-dd HH:mm:ss";
  }
  if (/(y+)/.test(fmt)) {
      fmt = fmt.replace(RegExp.$1, (date.getFullYear() + '').substr(4 - RegExp.$1.length))
  }
  let o = {
      'M+': date.getMonth() + 1,
      'd+': date.getDate(),
      'H+': date.getHours(),
      'm+': date.getMinutes(),
      's+': date.getSeconds()
  }
  for (let k in o) {
      if (new RegExp(`(${k})`).test(fmt)) {
          let str = o[k] + ''
          fmt = fmt.replace(RegExp.$1, RegExp.$1.length === 1 ? str : ('00' + str).substr(str.length));
      }
  }
  return fmt
};
 
//定義一個時間過濾器
Vue.filter("FormatDate", function(date, fmt) {
  return formatDate(date, fmt);
});