lib/fs.jsasyncfunctionopen(path,flags,mode){mode=modeNum(mode,0o666);path=getPathFromURL(path);validatePath(path);validateUint32(mode,'mode');returnnewFileHandle(awaitbinding.openFileHandle(pathModule.toNamespacedPath(path),stringToFlags(flags),mode,kUsePromises));}src/node_file.ccstaticvoidO...
复制 class Immediate{constructor(callback, args) {this._idleNext =null;this._idlePrev =null; /* 初始化参数 */this._onImmediate = callback;this._argv = args;this._destroyed =false;this[kRefed] =false;initAsyncResource(this,'Immediate');this.ref();immediateInfo[kCount]++;immediateQueue.a...
=nullptr){// open(path, flags, mode, req)AsyncCall(env,req_wrap_async,args,"open",UTF8,AfterInteger,uv_fs_open,*path,flags,mode);}else{// open(path, flags, mode, undefined, ctx)CHECK_EQ(argc,5);FSReqWrapSync req_wrap_
代码如下: /* TODO: 阻塞 - 捕获异常 */try{constfs=require('fs');constdata=fs.readFileSync('./file1.js');console.log(data)}catch(e){console.log('发生错误:',e)}console.log('正常执行') 如上即便发生了错误,也不会影响到后续代码的执行以及应用程序发生错误导致的退出。 同步I/O 模式造成代...
/* TODO: 阻塞 */constfs=require('fs');constdata=fs.readFileSync('./file.js');console.log(data) 代码阻塞 :读取同级目录下的file.js文件,结果data为buffer结构,这样当读取过程中,会阻塞代码的执行,所以console.log(data)将被阻塞,只有当结果返回的时候,才能正常打印data。
You can use sync-sql package of npm for execute async queries. https://www.npmjs.com/package/sync-sql Here is an example of it: const express = require('express') const mysql = require('mysql') const app = express() var syncSql = require('sync-sql'); // Create Connection const ...
[NodeJS] Promises and async/await grpc/grpc#12751 Closed Member murgatroid99 commented Sep 29, 2017 Thank you for moving this. I think this is an interesting idea that is worth exploring, but there are also some complications you haven't addressed. On the client side, these functions ...
async是声明一个异步的function,await是等待一个异步function的执行完成并获取异步function返回的数据,注意await外部包裹的方法必须是异步方法(扩展:所有返回为Promise的函数都可以用await获取其resolve的值) asyncfunctiontest(){returnnewPromise((resolve,reject)=>{ ...
app.use(async(ctx, next) => { const res = ctx.res; fs.readFile('./big.txt', (err, data) => { if (err) { throw err; } else { res.end(data); } }) }); app.listen(3001, () => { console.log('listening on 3001'); ...
UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an asyncfunctionwithouta catch block, or by rejecting a promise which was not handled with.catch(). To terminate the node process on unhandled promise rejection, use the CLI flag`--...