Node.js报错：UnhandledPromiseRejectionWarning: Unhandled promise rejection

UnhandledPromiseRejectionWarning: Unhandled promise rejection. 
This error originated either by throwing inside of an async function without a catch block,
 or by rejecting a promise which was not handled with .catch()

解决办法： 增加catch

new Promise((resolve, reject)=>{
    if(2>1) reject("foo")
    resolve("bar")
}).catch(()=>{})

参考
Promise的UnhandledPromiseRejectionWarning问题