MUI框架获取下拉框SELECT选中值

HTML代码：

<select οnchange="index.initClickOrg()" class="mui-h5" id="org" style="margin:auto; color:#000;">

<option class="org" value="1">1<option>

<option class="org" value="2">2<option>

<option class="org" value="3">3<option>

</select>

JS代码：

function initClickOrg(){

var rdsObj = document.getElementsByClassName("org");

var checkVal = null;

for(i = 0; i < rdsObj.length; i++){

if(rdsObj[i].selected){checkVal = rdsObj[i].value;}

}

retrun checkVal ;

}