组件添加add方法

packages/artplayer/src/control/time.js

@@ -0,0 +1,20 @@
+import { secondToTime } from '../utils';
+
+export default function time(option) {
+    return art => ({
+        ...option,
+        mounted: $control => {
+            function getTime() {
+                const newTime = `${secondToTime(art.player.currentTime)} / ${secondToTime(art.player.duration)}`;
+                if (newTime !== $control.innerHTML) {
+                    $control.innerHTML = newTime;
+                }
+            }
+
+            getTime();
+            ['video:loadedmetadata', 'video:timeupdate', 'video:progress'].forEach(event => {
+                art.on(event, getTime);
+            });
+        },
+    });
+}