javascript - 如何在javascript中将对象转换为字符串？

Question

下面我在这里粘贴了我的一段javascript代码

1)

  function showCustomerName(dropdown) {
  var selectedCustomer = dropdown.options[dropdown.selectedIndex].value;
  var currentCustomer = document.getElementById('currentCustomer');
  alert(selectedCustomer); 

  var context = document.forms[0].context.value;
  document.forms[0].mode.value = "UPDATE";
  document.forms[0].custName.value = selectedCustomer ;
  document.forms[0].action=context+"/updateReportDetail.do";
  document.forms[0].method="POST";
  document.forms[0].submit();
}

2)

 function showCustomerID(dropdown) {
  var currentCustomer = document.getElementById('currentCustomer');
  var selectedCustomerID = dropdown.options[dropdown.selectedIndex].value;
  alert(selectedCustomerID);   

  var context = document.forms[0].context.value;
  document.forms[0].mode.value = "UPDATE";
  document.forms[0].custName.value = currentCustomer;
  document.forms[0].custID.value = selectedCustomerID ;
  document.forms[0].action=context+"/updateReportDetail.do";
  document.forms[0].method="POST";
  document.forms[0].submit();
}


<select id="currentCustomer" onchange="showCustomerName(this)">
 <c:forEach var="Customer" items="${listCustomer}" >
   <option value="<c:out value="${Customer}" />"><c:out value="${Customer}" />
   </option>
  </c:forEach>
 </select>

<select id="currentCustomerID" onchange="showCustomerID(this)">
 <c:forEach var="CustomerID" items="${listCustomerID}" >
   <option value="<c:out value="${CustomerID}" />"><c:out value="${CustomerID}" />
   </option>
  </c:forEach>
 </select>

上面的代码运行良好。问题是我需要从“showCustomerName()”到“showCustomerID()”脚本中检索值。

在“showCustomerID()”脚本方法中，我正在检索“showCustomerName()”方法值作为对象

var currentCustomer = document.getElementById('currentCustomer');

如何将其作为值检索？我不想作为对象检索

请大家帮帮我

Answer 1

只需要抓取值

var currentCustomer = document.getElementById('currentCustomer').value;
alert(currentCustomer);

虽然你应该确保它存在

var currentCustomerElement = document.getElementById('currentCustomer');
var currentCustomer = (currentCustomerElement) ? currentCustomerElement.value : "not found";

或者我误解了您要检索的内容？