react元素显隐控制

const { selVal}=this.state;
return (
<span>
<span>  XXXXX：</span>
<Select placeholder='请选择' style={{ width: 150 }} onChange={onChange}>
<Option value="0">请选择</Option>
<Option value="1">XXX</Option>
<Option value="2">XXXXXX</Option>
{selVal[0]!=='1' &&<Option value="3">XXXXXXXX</Option>}
</Select>
</span>);
 
更新值：
that.setState({selVal:1});