修改包管理

packages/artplayer/src/layers.js

@@ -0,0 +1,39 @@
+import { append, setStyles, setStyle, insertByIndex } from './utils';
+
+let id = 0;
+export default class Layers {
+  constructor(art) {
+    this.art = art;
+    this.add = this.add.bind(this);
+    this.art.option.layers.forEach(item => {
+      this.add(item);
+    });
+  }
+
+  add(item, callback) {
+    if (!item.disable) {
+      const { refs: { $layers } } = this.art;
+      id++;
+      const $layer = document.createElement('div');
+      $layer.setAttribute('class', `art-layer art-layer-${item.name || id}`);
+      setStyle($layer, 'z-index', item.index || id);
+      append($layer, item.html);
+      setStyles($layer, item.style || {});
+      this.art.emit('layers:add', $layer);
+      callback && callback($layer);
+      insertByIndex($layers, $layer, item.index || id);
+    }
+  }
+
+  show() {
+    const { $layers } = this.art.refs;
+    setStyle($layers, 'display', 'block');
+    this.art.emit('layers:show', $layers);
+  }
+
+  hide() {
+    const { $layers } = this.art.refs;
+    setStyle($layers, 'display', 'none');
+    this.art.emit('layers:hide', $layers);
+  }
+}