nodejs监听目录，重命名文件

fs.watch('/Users/bj/gitlab/learn/zuigeng', (event, fileName)=>{
    if(event === "rename") {
    	if (fs.existsSync(`/Users/bj/gitlab/learn/zuigeng/${fileName}`)) {
		  fs.rename(`/Users/bj/gitlab/learn/zuigeng/${fileName}`,'/Users/bj/gitlab/learn/zuigeng/a1.js',err=>{
		  	if(err)
		  		console.log('重命名失败',err)
		  })
		} else{
			console.log('文件被删除')
		}
    }
});