原理：在普通表格增添input标签，使用v-model进行数据的绑定； 

<template>
  <!--表单的增删和修改-->
  <div class="hello">
    <table>
      <caption>麻将</caption>
      <thead>
      <tr>
        <th>条</th>
        <th>筒</th>
        <th>万</th>
        <th>操作</th>
      </tr>
      </thead>
      <tbody>
      <tr v-for="(mj,index) in mjs">
        <td>
          <input type="text" v-model="mj.tiao" v-if="edi===index">
          <span v-else>{{mj.tiao}}</span>
        </td>
        <td>
          <input type="text" v-model="mj.tong" v-if="edi===index">
          <span v-else>{{mj.tong}}</span>
        </td>
        <td>
          <input type="text" v-model="mj.wan" v-if="edi===index">
          <span v-else>{{mj.wan}}</span>
        </td>

        <td>
          <button @click="mod(index)">修改</button>
          <button @click="save(index)">确定</button>
          <button @click="del(index)">删除</button>
        </td>
      </tr>
      </tbody>
      <tfoot>
        <td colspan="4">
          <button @click="add">添加</button>
          <button @click="submit">保存</button>
        </td>
      </tfoot>
    </table>

  </div>
</template>

<script>
  export default {
    name: 'HelloWorld',
    data () {
      return {
        edi:'',
        mjs: [
          {tiao:'一条',tong:'一筒',wan:'壹万'},
          {tiao:'二条',tong:'二筒',wan:'贰万'},
          {tiao:'三条',tong:'三筒',wan:'叁万'},
        ]
      }
    },
    methods: {
      mod:function(index){
        this.edi=index;
      },
      del: function (index) {
        this.mjs.splice(index, 1);
      },
      save:function(index){
        this.edi=!index;
      },
      add:function(){
        this.mjs.push({tiao:'',tong:'',wan:''})
      },
      submit:function () {
        this.edi='';
        console.log(JSON.stringify(this.mjs))
      }
    }
  }
</script>

<style scoped>
  input{
    border:none;
    width:150px;
  }
  table{
  border-collapse: collapse;
  border:1px solid black
  }
  td{
    text-align: center;
    width: 150px;
    height:30px;
    border:1px solid black
  }
  button{
    border: none;
    background-color:deepskyblue;
    color:white;
  }
</style>