Add unescape utility function and

artplayerPluginMultipleSubtitles plugin

docs/assets/example/multiple.subtitles.js

@@ -0,0 +1,43 @@
+var art = new Artplayer({
+	container: '.artplayer-app',
+	url: '/assets/sample/video.mp4',
+	plugins: [
+		artplayerPluginMultipleSubtitles({
+			subtitles: [
+				{
+					name: 'chinese',
+					url: '/assets/sample/subtitle.cn.srt',
+				},
+				{
+					name: 'japanese',
+					url: '/assets/sample/subtitle.jp.srt',
+				}
+			]
+		})
+	]
+});
+
+
+// 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;
+	font-size: 18px;
+}
+
+.art-subtitle-japanese {
+	color: yellow;
+	font-size: 12px;
+}
+`;
+
+const $style = document.getElementById('artplayer-subtitle-style');
+if ($style) {
+	$style.textContent = style;
+} else {
+	const $style = document.createElement('style');
+	$style.id = 'artplayer-subtitle-style';
+	$style.textContent = style;
+	document.head.appendChild($style);
+}