feat(demo): add `JsonPreview` demo

添加JsonPreview组件的使用演示

close: #1146

src/views/demo/editor/json/index.vue

@@ -14,8 +14,8 @@
   </PageWrapper>
 </template>
 <script lang="ts">
-  import { defineComponent, ref } from 'vue';
-  import { CodeEditor } from '/@/components/CodeEditor';
+  import { defineComponent, ref, unref, h } from 'vue';
+  import { CodeEditor, JsonPreview } from '/@/components/CodeEditor';
   import { PageWrapper } from '/@/components/Page';
   import { Radio, Space, Modal } from 'ant-design-vue';
 
@@ -82,8 +82,15 @@
       }
 
       function showData() {
+        if (unref(modeValue) === 'application/json') {
+          Modal.info({
+            title: '编辑器当前值',
+            content: h(JsonPreview, { data: JSON.parse(value.value) }),
+          });
+        } else {
           Modal.info({ title: '编辑器当前值', content: value.value });
         }
+      }
 
       return { value, modeValue, handleModeChange, showData };
     },