请教下element-ui中的render写法

Question

研究了下element-ui中的组件源码，发现其中组件的render写法都是：

render(h) {
    const columnsHidden = this.columns.map((column, index) => this.isColumnHidden(index));
    return (
      <table
        class="el-table__body"
        cellspacing="0"
        cellpadding="0"
        border="0">
        <colgroup>
          {
            this._l(this.columns, column =>
              <col
                name={ column.id }
                width={ column.realWidth || column.width }
              />)
          }
        </colgroup>
        <tbody>
          {
            this._l(this.data, (row, $index) =>
              [<tr
                style={ this.rowStyle ? this.getRowStyle(row, $index) : null }
                key={ this.table.rowKey ? this.getKeyOfRow(row, $index) : $index }
                on-dblclick={ ($event) => this.handleDoubleClick($event, row) }
                on-click={ ($event) => this.handleClick($event, row) }
                on-contextmenu={ ($event) => this.handleContextMenu($event, row) }
                on-mouseenter={ _ => this.handleMouseEnter($index) }
                on-mouseleave={ _ => this.handleMouseLeave() }
                class={ [this.getRowClass(row, $index)] }>
                {
                  this._l(this.columns, (column, cellIndex) =>
                    <td
                      class={ [column.id, column.align, column.className || '', columnsHidden[cellIndex] ? 'is-hidden' : '' ] }
                      on-mouseenter={ ($event) => this.handleCellMouseEnter($event, row) }
                      on-mouseleave={ this.handleCellMouseLeave }>
                      {
                        column.renderCell.call(this._renderProxy, h, { row, column, $index, store: this.store, _self: this.context || this.table.$vnode.context })
                      }
                    </td>
                  )
                }
                {
                  !this.fixed && this.layout.scrollY && this.layout.gutterWidth ? <td class="gutter" /> : ''
                }
              </tr>,
                this.store.states.expandRows.indexOf(row) > -1
                ? (<tr>
                    <td colspan={ this.columns.length } class="el-table__expanded-cell">
                      { this.table.renderExpanded ? this.table.renderExpanded(h, { row, $index, store: this.store }) : ''}
                    </td>
                  </tr>)
                : ''
              ]
            )
          }
        </tbody>
      </table>
    );
    
    

发现其打包编译后才会是官网上crementElement的那种形式，我自己使用按照这种形式写了一个demo，render中直接写模板内容发现编译一直通过不了，是为什么？

     render(h) {
      return (
            <table>
                <thead>
                    <tr>
                        {
                            this._l(this.columns, (column, cellIndex) =>
                                <th><span>{column.name}</span></th>
                            )
                        }
                    </tr>
                </thead>
            </table>
      );
    }
    
    
    提示<table>这里Unexpected token (13:12)

Answer 1

有没有发现那段代码和react还挺像的，因为那就是jsx嘛，还好文档里有：

FAQ.md