使用Globe互联网服务提供商时JQuery无法正常工作求助

• 基于jQuery+Bootstrap的Web应用原本运行正常，突然出现功能失效，更换互联网服务提供商（ISP）后恢复正常，控制台显示第三方CDN资源加载失败。
• 核心代码如下：

<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.1/dist/umd/popper.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>
<script>
    $(document).ready(function() {
        $('[data-toggle="tooltip"]').tooltip();

        // Function to filter data while typing
        $('#searchInput').on('input', function() {
            var searchValue = $(this).val().toLowerCase();
            $('.employee-row').filter(function() {
                $(this).toggle($(this).text().toLowerCase().indexOf(searchValue) > -1);
            });
            updateCounter();
        });
    });

    function filterEstablishments() {
        var statusFilter = document.getElementById("statusFilter").value;
        var fireDistrictFilter = document.getElementById("fireDistrictFilter").value;
        var cityFireStationFilter = document.getElementById("cityfirestationfilter").value;
        var startDateFilter = document.getElementById("startDateFilter").value;
        var endDateFilter = document.getElementById("endDateFilter").value;
        var tableRows = document.getElementById("establishmentTableBody").getElementsByTagName("tr");

        for (var i = 0; i < tableRows.length; i++) {
            var statusCell = tableRows[i].querySelector(".status");
            var fireDistrictCell = tableRows[i].querySelector(".fire_district");
            var cityFireStationCell = tableRows[i].querySelector(".city_fire_station");
            var dateOfIssuance1Cell = tableRows[i].querySelector(".dateofissuance1");
            var dateOfIssuance2Cell = tableRows[i].querySelector(".dateofissuance2");
            var status = statusCell.textContent;
            var fireDistrict = fireDistrictCell.textContent;
            var cityFireStation = cityFireStationCell.textContent;
            var dateOfIssuance1 = dateOfIssuance1Cell ? dateOfIssuance1Cell.textContent : null;
            var dateOfIssuance2 = dateOfIssuance2Cell ? dateOfIssuance2Cell.textContent : null;

            var statusMatch = statusFilter === "all" || (statusFilter === "Issued_FSIC" && status === "Issued_FSIC") || (statusFilter === "Issued_NTC" && status === "Issued_NTC");
            var fireDistrictMatch = fireDistrictFilter === "all" || fireDistrictFilter === fireDistrict;
            var cityFireStationMatch = cityFireStationFilter === "all" || cityFireStationFilter === cityFireStation;
            var dateMatch = true;

            if (startDateFilter && endDateFilter) {
                var startDate = new Date(startDateFilter);
                var endDate = new Date(endDateFilter);

                if (status === "Issued_FSIC" && dateOfIssuance1) {
                    var issuanceDate = new Date(dateOfIssuance1);
                    dateMatch = issuanceDate >= startDate && issuanceDate <= endDate;
                } else if (status === "Issued_NTC" && dateOfIssuance2) {
                    var issuanceDate = new Date(dateOfIssuance2);
                    dateMatch = issuanceDate >= startDate && issuanceDate <= endDate;
                }
            }

            if (statusMatch && fireDistrictMatch && dateMatch && cityFireStationMatch) {
                tableRows[i].style.display = "";
            } else {
                tableRows[i].style.display = "none";
            }
        }

        updateCounter();
    }

    function updateCounter() {
        var displayedRows = $('#establishmentTableBody').find('tr:visible').length;
        $('#recordCounter').text("Total: " + displayedRows);
    }
 $(document).ready(function() {
        $('#addModal').on('show.bs.modal', function(e) {
            var url = './create.php'; // Replace with the URL of your external page

            $.get(url, function(data) {
                $('#addModalBody').html(data);
            });
        });
    });
</script>

• 本地托管静态资源（最可靠）
  下载jQuery、Popper.js、Bootstrap的JS文件到自己的Web服务器目录（如/static/js/），替换CDN链接为本地路径：

  <script src="/static/js/jquery-3.5.1.min.js"></script>
  <script src="/static/js/popper.min.js"></script>
  <script src="/static/js/bootstrap.min.js"></script>
  

  彻底规避ISP对第三方CDN的拦截问题。

• 添加CDN降级备用方案
  保留CDN链接的同时，添加本地备用逻辑，当CDN加载失败时自动切换到本地资源：

  <script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
  <script>window.jQuery || document.write('<script src="/static/js/jquery-3.5.1.min.js"><\/script>')</script>
  
  <script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.1/dist/umd/popper.min.js"></script>
  <script>window.Popper || document.write('<script src="/static/js/popper.min.js"><\/script>')</script>
  
  <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>
  <script>window.bootstrap || document.write('<script src="/static/js/bootstrap.min.js"><\/script>')</script>
  

• 升级资源版本
  旧版本CDN资源可能存在ISP拦截或服务终止情况，升级到同系列稳定新版本（如jQuery 3.6.4、Bootstrap 4.6.2），更换链接后测试兼容性。

• 优化DNS解析
  提示用户切换公共DNS（如Cloudflare 1.1.1.1、Google 8.8.8.8），或在自身域名DNS设置中开启CDN加速，绕过ISP的DNS污染。

内容的提问来源于stack exchange，提问作者bfpncr ICT