diff --git a/static/index.html b/static/index.html
index c06f3c02..db7ce3fa 100644
--- a/static/index.html
+++ b/static/index.html
@@ -3135,6 +3135,10 @@ function renderAlerts(alerts) {
 // refreshAll 内联渲染：把 alerts 交给 renderAlerts
 
 
+function esc(s) {
+    return String(s || '').replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;').replace(/"/g,'&quot;');
+}
+
 function loadBroadcast() {
     var el = document.getElementById('broadcast-list');
     if (!el) return;