fix bug

src/loading.js

@@ -3,23 +3,26 @@ import Icons from './icons';
 export default class Loading {
   constructor(art) {
     this.art = art;
+    this.state = false;
     this.init();
   }
 
   init() {
-    const { option } = this.art;
+    const { option, refs: { $loading } } = this.art;
     if (option.loading) {
-      this.art.refs.$loading.insertAdjacentHTML('beforeend', option.loading);
+      $loading.insertAdjacentHTML('beforeend', option.loading);
     } else {
-      this.art.refs.$loading.appendChild(Icons.loading);
+      $loading.appendChild(Icons.loading);
     }
   }
 
   hide() {
+    this.state = false;
     this.art.refs.$loading.style.display = 'none';
   }
 
   show() {
+    this.state = true;
     this.art.refs.$loading.style.display = 'block';
   }
 }