我在这里阅读过其他类似的问题，但我不是开发人员，所以我需要一个针对初学者（或虚拟傻瓜）的答案，以尝试修复我的小网站。
我收到此错误，这使我的目录网站无法加载地图上的列表（因此使网站无法正常工作）：
JQMIGRATE: Migrate is installed, version 1.4.1
map-template.js?ver=1.0.0:669 Uncaught TypeError: Cannot read property 'toString' of undefined
at Object.<anonymous> (map-template.js?ver=1.0.0:669)
at Function.each (jquery.js?ver=1.12.4-wp:2)
at HTMLSelectElement.<anonymous> (map-template.js?ver=1.0.0:668)
at Function.each (jquery.js?ver=1.12.4-wp:2)
at Object.apply_meta_filter (map-template.js?ver=1.0.0:660)
at Object.filter (map-template.js?ver=1.0.0:556)
at Object.success (map-template.js?ver=1.0.0:195)
at i (jquery.js?ver=1.12.4-wp:2)
at Object.fireWith [as resolveWith] (jquery.js?ver=1.12.4-wp:2)
at x (jquery.js?ver=1.12.4-wp:4)
(anonymous) @ map-template.js?ver=1.0.0:669
each @ jquery.js?ver=1.12.4-wp:2
(anonymous) @ map-template.js?ver=1.0.0:668
each @ jquery.js?ver=1.12.4-wp:2
apply_meta_filter @ map-template.js?ver=1.0.0:660
filter @ map-template.js?ver=1.0.0:556
(anonymous) @ map-template.js?ver=1.0.0:195
i @ jquery.js?ver=1.12.4-wp:2
fireWith @ jquery.js?ver=1.12.4-wp:2
x @ jquery.js?ver=1.12.4-wp:4
c @ jquery.js?ver=1.12.4-wp:4
XMLHttpRequest.send (async)
send @ jquery.js?ver=1.12.4-wp:4
ajax @ jquery.js?ver=1.12.4-wp:4
n.<computed> @ jquery.js?ver=1.12.4-wp:4
getJSON @ jquery.js?ver=1.12.4-wp:4
init @ map-template.js?ver=1.0.0:182
(anonymous) @ map-template.js?ver=1.0.0:2029
(anonymous) @ map-template.js?ver=1.0.0:2282
我可以自己解决这个问题吗？
非常感谢您的帮助！ 亲切的问候， 米拉
It's hard to understand a problem without some detailed context. But, what I can see, that you are trying to show some list, where some list items are not defined (
undefined) or haveundefinedfields. So theseundefinedvalues cannot be converted into strings (toString()).我可能是错的，但是我建议的是检查要显示的所有项目及其字段的存在。