极客观点
项目管理
HarmonyOS
今天在github上clone了两个项目，[1][2]都是两年前的项目，想着研究研究，结果在本地运行npm run dev起不来，发现报错类似：
(node:17352) UnhandledPromiseRejectionWarning: Error: Exited with code 4
at ChildProcess.<anonymous> (/home/yeoman/文档/learn-projects/ReadMore/node_modules/opn/index.js:83:13)
at Object.onceWrapper (events.js:285:13)
at ChildProcess.emit (events.js:197:13)
at maybeClose (internal/child_process.js:984:16)
at Socket.stream.socket.on (internal/child_process.js:401:11)
at Socket.emit (events.js:197:13)
at Pipe._handle.close (net.js:611:12)
(node:17352) 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(). (rejection id: 3)
(node:17352) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
(node:19360) UnhandledPromiseRejectionWarning: Error: Exited with code 4
at ChildProcess.<anonymous> (/home/yeoman/文档/learn-projects/vue-nReader/node_modules/opn/index.js:83:13)
at Object.onceWrapper (events.js:285:13)
at ChildProcess.emit (events.js:197:13)
at maybeClose (internal/child_process.js:984:16)
at Socket.stream.socket.on (internal/child_process.js:401:11)
at Socket.emit (events.js:197:13)
at Pipe._handle.close (net.js:611:12)
(node:19360) 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(). (rejection id: 1)
(node:19360) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
操作系统： Linux 4.19.30-1-MANJARO
node: v11.11.0
npm: 6.9.0
看到后面那段，好像是在说，promise缺少了处理reject的catch，你看看代码有没有哪里出错了？