Get the value of the dropdown list combined with ajax

<td>Selectable customers: <select name="cusid" id="sel"
style="width: 100px; text-align: center;" onchange="cusajax() "> //This event will select option Fired when
  <option value="">Select Customer</option>
  <c:forEach items="${cusInfoList }" var="cusinfo">
    <option value="${cusinfo.cusid}">${cusinfo. cusname }</option>
  </c:forEach>
</select>
</td>

function cusajax(){
  var cusIdvalue=$("#sel").val();   //这边就可以获得选取的option的value值
  if(cusIdvalue=="" ||cusIdvalue==null){
    $("#address1").val("");
    $("#phone1").val("");
  }
  //alert(cusIdvalue+">>>>");
  $.ajax({
    url: "${ctx}/psi/sale/selCusAjax",
    type: "POST",
    data:{"cusIdvalue":cusIdvalue},
    dataType: "json",
    success: function (data) {
    //alert(data.cusInfo.cusaddress);
    $("#address1").val(data.cusInfo.cusaddress);
    $("#phone1").val(data.cusInfo.cusphone);
    }
  });
};

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