fix bugs in page

docs/js/reagent/debug.cljs

@@ -0,0 +1,27 @@
+(ns reagent.debug
+  (:require-macros [reagent.debug]))
+
+(def ^:const has-console (exists? js/console))
+
+(def ^boolean tracking false)
+
+(defonce warnings (atom nil))
+
+(defonce track-console
+  (let [o #js{}]
+    (set! (.-warn o)
+          (fn [& args]
+            (swap! warnings update-in [:warn] conj (apply str args))))
+    (set! (.-error o)
+          (fn [& args]
+            (swap! warnings update-in [:error] conj (apply str args))))
+    o))
+
+(defn track-warnings [f]
+  (set! tracking true)
+  (reset! warnings nil)
+  (f)
+  (let [warns @warnings]
+    (reset! warnings nil)
+    (set! tracking false)
+    warns))