js判断是不是功能可用

//判断是否有此功能
<%!public boolean check(String function, String[] functions) {
  if (functions == null || functions.length == 0) {
   return true;
  }
  for (int i = 0; i < functions.length; i++) {
   if (function.equals(functions[i])) {
    return true;
   }
  }
  return false;
 }%>
<%
request.setCharacterEncoding("utf-8");
%>

//定义可用的功能
<%
 String[] functions = new String[] { "overview", "navigator", "layerControl", "spatialQuery", "sqlQuery", "bufferQuery", "findPath", "findNearest",
 "edit", "closestFacility", "overlayAnalyst", "dynamicTheme", "statistic", "switchMap"};
%>

//判断是否可用
<%
   if (check("overview", functions)) {
%>
      zhongguo
<%}%>