diff --git a/packages/dialog/src/dialog.js b/packages/dialog/src/dialog.js
index 0a3ff9623..fa295ac15 100644
--- a/packages/dialog/src/dialog.js
+++ b/packages/dialog/src/dialog.js
@@ -24,7 +24,7 @@ const defaultCallback = action => {
   }
 };
 
-var initInstance = () => {
+const initInstance = () => {
   instance = new DialogConstructor({
     el: document.createElement('div')
   });
@@ -32,7 +32,7 @@ var initInstance = () => {
   instance.callback = defaultCallback;
 };
 
-var showNextDialog = () => {
+const showNextDialog = () => {
   if (!instance) {
     initInstance();
   }
diff --git a/src/mixins/popup/popup-manager.js b/src/mixins/popup/popup-manager.js
index c339df3a9..9ba799094 100644
--- a/src/mixins/popup/popup-manager.js
+++ b/src/mixins/popup/popup-manager.js
@@ -52,6 +52,9 @@ const PopupManager = {
     }
   },
 
+  /**
+   * 遮罩层点击回调，`closeOnClickOverlay`为`true`时会关闭当前`popup`
+   */
   handleOverlayClick() {
     const topModal = PopupManager.modalStack[PopupManager.modalStack.length - 1];
     if (!topModal) return;