Google Map MarkerManager：无法调用undefined的方法substr

Question

我有一个网络应用程序，它使用以下Google Maps开源MarkerManager JavaScript在Google地图上绘制地理位置。它突然停止工作，并抱怨调用substr方法的东西是未定义的。 Google main.js突然出现了这个问题？

MarkerManager.js的第98行（本地代码）：

 if (typeof map.mapTypes.get(sType) === 'object' && typeof map.mapTypes.get(sType).maxZoom === 'number') {

https://maps.gstatic.com/intl/en_us/mapfiles/api-3/10/15a/main.js（Google Code）第24和25行：

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错误：

脚本代码段

 MarkerManager.prototype.initialize = function (map, opt_opts) {
      var me = this;

      opt_opts = opt_opts || {};
      me.tileSize_ = MarkerManager.DEFAULT_TILE_SIZE_;

      var mapTypes = map.mapTypes;

      // Find max zoom level
      var mapMaxZoom = 1;
      for (var sType in mapTypes ) {
//below line is line 98
        if (typeof map.mapTypes.get(sType) === 'object' && typeof map.mapTypes.get(sType).maxZoom === 'number') {
          var mapTypeMaxZoom = map.mapTypes.get(sType).maxZoom;
          if (mapTypeMaxZoom > mapMaxZoom) {
            mapMaxZoom = mapTypeMaxZoom;
          }
        }
      }

Answer 1

我还遇到了两个使用gmaps + markermanager

的应用程序的问题

要暂时解决问题，我必须从发布版更改为v3.9 api（Google Maps JavaScript API v3）

https://maps.googleapis.com/maps/api/js?v=3.9&sensor=false

===========================================

此问题已报告给gmaps-api-issues，建议的解决方案适用于v3.9，v3.10和v3.11：

http://code.google.com/p/gmaps-api-issues/issues/detail?id=4543&q=markermanager&colspec=ID%20Type%20Status%20Introduced%20Fixed%20Summary%20Stars%20ApiType%20Internal

===========================================

尝试编辑文件markermanager.js

更改此行：

if（typeof map.mapTypes.get（sType）==='object'＆amp;＆amp; typeof map.mapTypes.get（sType）.maxZoom ==='number'）{

到

if（sType！=“constructor”＆amp;＆amp; typeof map.mapTypes.get（sType）==='object'＆amp;＆amp; typeof map.mapTypes.get（sType）.maxZoom ==='number '）{

Answer 2

我在markermanagerv1.1

中出现了同样的问题 话语线（98）看起来略有不同：

    if (mapTypes.hasOwnProperty(sType) && mapTypes.get(sType).maxZoom === 'number') {

仍然，将其更改为上述行解决了问题：

if (sType!="constructor" && typeof map.mapTypes.get(sType) === 'object' && typeof map.mapTypes.get(sType).maxZoom === 'number') {