<Form.Item label="XX" className="custom_form_item">
……
</Form.Item>// 样式
.custom_form_item {.ant-form-item-label > {::before {display: inline-block;margin-right: 4px;color: red;font-size: 14px;font-family: SimSun, sans-serif;line-height: 1;content: '*';}}
}