JavaScript获取select中text值的方法

<select name="parent_id" onchange="setTitleAndLinkByGoodsCategory(this.value,this.options[this.selectedIndex].text);" >
  <option value="0">请选择商品分类</option>
  <option value="1" >家电</option>
  <option value="2" >数码</option>
  <option value="3" >服饰</option>
</select>

<script language="javascript">
 function chk(){
 var obj = document.getElementById("sel");
 var strsel = obj.options[obj.selectedIndex].text;
 if (confirm("确定要选择"+strsel+"吗？")){
 }else{
 }
 }
</script>
<select name="sel" onchange="return chk()">
 <option value=1>a001</option>
 <option value=2>a002</option>
 <option value=3>a003</option>
</select>