watcher.ref()

• 返回: <fs.StatWatcher>

调用时，只要 <fs.StatWatcher> 处于活动状态，就请求 Node.js 事件循环不退出。 多次调用 watcher.ref() 将不起作用。

默认情况下，所有 <fs.StatWatcher> 对象都被“引用”，这使得通常不需要调用 watcher.ref() 除非之前已经调用过 watcher.unref()。

• Returns: <fs.StatWatcher>

When called, requests that the Node.js event loop not exit so long as the <fs.StatWatcher> is active. Calling watcher.ref() multiple times will have no effect.

By default, all <fs.StatWatcher> objects are "ref'ed", making it normally unnecessary to call watcher.ref() unless watcher.unref() had been called previously.