fix

@@ -434,6 +434,9 @@ function structureOption($obj, data, selectId) {
     var countyId;
 
     for (i = 0; i < data.length; i++) {
+        if (!countyId) {
+            countyId = data[i].id;
+        }
 
         if (data[i].is_support_express === 'Y') {
             isStar = '*';
@@ -457,12 +460,11 @@ function structureOption($obj, data, selectId) {
     } else if ($obj.attr('name') === 'county') {
         defaultOption = '<option value="0">请选择区县</option>';
     } else if ($obj.attr('name') === 'street') {
-        selectId += '';
-        countyId = selectId.substr(0, 6);
-
         defaultOption = '<option value="0">请选择乡镇／街道</option>';
 
         if (countyId) {
+            countyId += '';
+            countyId = countyId.substr(0, 6);
             defaultOption += '<option value="' + countyId + '">全部</option>';
         }
     }