嘗試用 `$("#labCurrentPage").change(function () {})` 監聽 Label 內容變化，但無效果。
Label 不是表單輸入控件，不支持 `change` 事件。`change` 僅適用於 ``、``、`` 等用戶可交互修改值的元素。Label 只是靜態文本容器，其內容通常由 JavaScript 直接修改 `innerHTML` 或 `textContent`，不會觸發瀏覽器原生事件。</p> <h2>解決方案</h2> <h3>方案一：自定義事件觸發（推薦）</h3> <p>在修改 Label 文本的代碼處主動觸發自定義事件：</p> <pre><code>// 修改文本時 $("#labCurrentPage").text("新內容").trigger("labelChanged"); // 監聽 $("#labCurrentPage").on("labelChanged", function() { console.log("Label 內容已更新:", $(this).text()); }); </code></pre> <h3>方案二：MutationObserver 監聽 DOM 變化</h3> <p>適用於無法控制修改代碼的場景：</p> <pre><code>var observer = new MutationObserver(function(mutations) { console.log("Label 內容變化:", $("#labCurrentPage").text()); }); observer.observe(document.getElementById("labCurrentPage"), { childList: true, characterData: true, subtree: true }); </code></pre> <h3>方案三：輪詢（不推薦）</h3> <p>定時器檢查值是否變化，性能差，僅作兜底。</p> <h2>總結</h2> <p>Label 無原生 change 事件。修改代碼處主動 `trigger` 自定義事件最清晰可控；若不可控，用 `MutationObserver` 監聽 DOM 變化。</p> <div class="qcxs_ie_he"></div> </div> <div class="akevx_own"> <script language='javascript' 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