ui: 支持设置编辑器模式偏好

packages/ui-default/components/cmeditor/index.js

@@ -9,7 +9,7 @@ export const config = {
     'upload', 'record', '|',
     'edit-mode', 'content-theme', 'code-theme', 'export', 'preview',
   ],
-  mode: 'ir',
+  mode: UserContext.preferedEditorType || 'ir',
   toolbarConfig: {
     pin: true,
   },

packages/ui-default/components/cmeditor/textareaHandler.js

@@ -11,7 +11,7 @@ export default class TextareaHandler extends DOMAttachedObject {
 
   isCmEditor() {
     const editor = this.getCmEditor();
-    return (editor !== undefined && editor.isValid());
+    return (editor && editor.isValid);
   }
 
   val(...argv) {