Fix async issue in plugin addition

docs/assets/example/multiple.subtitles.js

@@ -1,6 +1,7 @@
 var art = new Artplayer({
 	container: '.artplayer-app',
 	url: '/assets/sample/video.mp4',
+	setting: true,
 	plugins: [
 		artplayerPluginMultipleSubtitles({
 			subtitles: [
@@ -13,15 +14,77 @@ var art = new Artplayer({
 					url: '/assets/sample/subtitle.jp.srt',
 				}
 			],
-			onMerge(trees) {
-				console.log(trees)
-			}
 		})
-	]
+	],
+	settings: [
+        {
+            width: 200,
+            html: 'Subtitle',
+            tooltip: 'Double',
+            icon: '<img width="22" heigth="22" src="/assets/img/subtitle.svg">',
+            selector: [
+                {
+                    html: 'Display',
+                    tooltip: 'Show',
+                    switch: true,
+                    onSwitch: function (item) {
+                        item.tooltip = item.switch ? 'Hide' : 'Show';
+						// 显示/隐藏字幕
+						// Show/hide subtitles
+						art.subtitle.show = !item.switch;
+                        return !item.switch;
+                    },
+                },
+				{
+                    html: 'Reverse',
+                    tooltip: 'Off',
+                    switch: false,
+                    onSwitch: function (item) {
+                        item.tooltip = item.switch ? 'Off' : 'On';
+						// 修改字幕顺序
+						// Change the order of subtitles
+						if (item.switch) {
+							art.plugins.multipleSubtitles.tracks(['chinese', 'japanese']);
+						} else {
+							art.plugins.multipleSubtitles.tracks(['japanese', 'chinese']);
+
+						}
+                        return !item.switch;
+                    },
+                },
+                {
+                    default: true,
+                    html: 'Double',
+                    name: 'double',
+                },
+                {
+                    html: 'Chinese',
+                    name: 'chinese',
+                },
+                {
+                    html: 'Japanese',
+                    name: 'japanese',
+                },
+            ],
+            onSelect: function (item) {
+				if (item.name === 'double') {
+					// 重置字幕
+					// Reset subtitles
+					art.plugins.multipleSubtitles.reset();
+				} else {
+					// 显示单个字幕
+					// Show single subtitle
+					art.plugins.multipleSubtitles.tracks([item.name]);
+				}
+                return item.html;
+            },
+        },
+    ],
 });
 
 // 自定义你自己的样式，请勿复制以下代码
 // Customize your own style, please do not copy the following code
+
 const style = `
 .art-subtitle-chinese {
 	color: red;