下拉菜单 - spinner
# 下来菜单控件: spinner
## setSelection()
设置选中项
```js
ui.objectId.setSelection(index);
```
## getSelectedItemPosition()
获取选中项
```js
ui.objectId.getSelectedItemPosition();
```
# 实例
```js
"ui";
ui.layout(
<vertical padding="16">
<horizontal>
<text textSize="16sp">下拉菜单</text>
<spinner id="sp1" entries="选项1|选项2|选项3"/>
</horizontal>
<horizontal>
<text textSize="16sp">对话框菜单</text>
<spinner id="sp2" entries="选项4|选项5|选项6" spinnerMode="dialog"/>
</horizontal>
<button id="ok">确定</button>
<button id="select3">选择选项3</button>
</vertical>
);
ui.ok.on("click", ()=>{
var i = ui.sp1.getSelectedItemPosition();
var j = ui.sp2.getSelectedItemPosition();
toast("您的选择是选项" + (i + 1) + "和选项" + (j + 4));
});
ui.select3.on("click", ()=>{
ui.sp1.setSelection(2);
});
```