add player controller

src/utils.js

@@ -0,0 +1,33 @@
+export function inlineCss(cssObj) {
+  let style = '';
+  Object.keys(cssObj).forEach(key => {
+    style += `${key}: ${cssObj[key]};`;
+  });
+  return style;
+}
+
+function padZero(num, len = 2) {
+  const threshold = Math.pow(10, len - 1);
+  if (num < threshold) {
+    num = String(num);
+    while (String(threshold).length > num.length) {
+      num = '0' + num;
+    }
+  }
+  return num;
+}
+
+const SECOND = 1000;
+const MINUTE = 60 * SECOND;
+const HOUR = 60 * MINUTE;
+export function formatTime(ms) {
+  const hour = Math.floor(ms / HOUR);
+  ms = ms % HOUR;
+  const minute = Math.floor(ms / MINUTE);
+  ms = ms % MINUTE;
+  const second = Math.floor(ms / SECOND);
+  if (hour) {
+    return `${padZero(hour)}:${padZero(minute)}:${padZero(minute)}`;
+  }
+  return `${padZero(hour)}:${padZero(second)}`;
+}