element-ui table组件设置背景颜色透明

捣鼓了好长时间；总结如下几个注意点

1.重写样式要加（>>>或者/deep/），不然不会生效

2.th ，tr都有背景颜色，都要重写，

废话不多说，粘贴代码：

<template>
    <div class="table-wrapper">
     <template>
  <el-table :row-style="getRowClass" :header-row-style="getRowClass" :header-cell-style="getRowClass" 
    :data="tableData"
    style="width: 1200px">
    <el-table-column
      label="序号"
      prop="list"
      width="88">
    </el-table-column>

    <el-table-column
      label="园区/监管仓名称"
      prop="name"
      width="180">
    </el-table-column>

    <el-table-column
      label="类型"
      prop="type"
      width="180">
    </el-table-column>

    <el-table-column
      label="创建人"
      prop="creator"
      width="180">
    </el-table-column>

    <el-table-column
      label="创建时间"
      prop="data"
      width="180">
    </el-table-column>
    <el-table-column label="操作">
      <template slot-scope="scope">
        <el-button
          size="mini" type="text"
          @click="handleEdit(scope.$index, scope.row)">修改</el-button>
      </template>
    </el-table-column>
  </el-table>
</template>
    
    
    </div>
</template>


<script>


export default {
    name: 'warehouse-manage',
    data() {
      return {
        tableData: [{
          list: '1',
          name: '福田保税区',
          type: '园区',
          creator:'张三',
          data:'2020-02-09 15:05:24'
        }, {
          list: '2',
          name: '福田保税区',
          type: '园区',
          creator:'张三',
          data:'2020-02-09 15:05:24'
        }, {
          list: '3',
          name: '福田保税区',
          type: '园区',
          creator:'张三',
          data:'2020-02-09 15:05:24'
        },]
      }
    },
    methods: {
         getRowClass({ row, column, rowIndex, columnIndex }) {
                return "background:#3f5c6d2c;";
            },
      handleEdit(index, row) {
        console.log(index, row);
      },
      handleDelete(index, row) {
        console.log(index, row);
      }
    }
  }
</script>
<style lang="less" scoped>
 .table-wrapper /deep/ .el-table--fit{
        padding: 20px;
}
 .table-wrapper /deep/  .el-table, .el-table__expanded-cell {
    background-color: transparent;
}

 .table-wrapper /deep/ .el-table tr {
    background-color: transparent!important;
}
 .table-wrapper /deep/  .el-table--enable-row-transition .el-table__body td, .el-table .cell{
    background-color: transparent;
}

</style>

效果图如下：