Menu

<Menu>
  <Item
    callback={(e) => {
      e.map.zoomIn();
    }}
    text="放大一级"
  />
  <Item
    callback={function (e) {
      e.map.zoomOut();
    }}
    text="缩小一级"
    iconUrl="http://lbsyun.baidu.com/skins/MySkin/resources/img/red.png"
  />
</Menu>