refactor example demo (#713)

* refactor: Adjust the example directory structure

* perf form demo

* refine editor-slide-upload css

* refine demo

src/utils/index.js

@@ -261,3 +261,7 @@ export function deepClone(source) {
   })
   return targetObj
 }
+
+export function uniqueArr(arr) {
+  return Array.from(new Set(arr))
+}