mkdirnodejs-event-loop-examplecdnodejs-event-loop-example npm init -y 步骤2: 创建 JavaScript 文件 在项目目录中创建一个名为fileReader.js的 JavaScript 文件,然后添加以下代码: constfs =require('fs');// 异步文件读取fs.readFile('example.txt','utf8',(err, data) =>{if(err) {console.error('...
}downloadFile('https://example.com/file.txt') .then(() =>{console.log('File download complete'); }); async/await:async/await是基于Promise的一种更简洁的异步编程模型。通过使用async关键字声明一个函数为异步函数,然后在函数内部使用await关键字等待Promise的结果。 asyncfunctiondownloadFile(url) {return...
$ deno run \https://deno.land/std/examples/curl.ts \https://example.com 上面例子中,Deno 执行远程脚本curl.ts,用这个脚本去抓取网址example.com。但是,运行后报错,表示没有网络通信的权限。 我们给予 Deno 网络通信的权限,就可以顺利执行。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 $ deno ru...
//`eventLoop` is an array that acts as a queue队列,先排队的先办理vareventLoop =[ ];varevent;//keep going "forever"while(true) {//perform a "tick"if(eventLoop.length > 0) {//get the next event in the queueevent =eventLoop.shift();//now, execute the next eventtry{ event(); }...
As we’ve seen in the previous example, we would either need to move these values into a higher scope or create a non-semantic array to pass these values on. Array iteration methods You can usemap,filterandreducewith async functions, although they behave pretty unintuitively. Try guessing wh...
Break up monolithic tasks that may otherwise block the Node.js event loop. For example, if a user request requires CPU intensive work like audio transcoding, you can delegate this task to other processes, freeing up user-facing processes to remain responsive. Provide a reliable communication chann...
JS-son supports an alternative goal-based reasoning loop. Here, we show a minimal working example of an agent that employs this approach. Our agent has merely one goal:const goals = { praiseDog: Goal('praiseDog', false, { dogName: 'Hasso' }) }...
For example, create folder recursively:var fs = require('fs'); var asyncLoop = require('node-async-loop'); var directories = ['test', 'test/hello', 'test/hello/world']; asyncLoop(directories, function (directory, next) { fs.mkdir(directory, function (err) { if (err) { next(err)...
(output); //output='Synatx error' }); // Example 4 - Restricted code s.run( "process.platform", function( output ) { console.log(output); //output=Null }) // Example 5 - Infinite loop s.run( "while (true) {}", function( output ) { console.log(output); //output='Timeout'...
Async Hooks:node api; Among the above four schemes, domain has been abandoned due to serious memory leaks; the implementation of zone.js is very violent, the API is relatively obscure, and the most critical disadvantage is that monkey patch can only mock api, not mock language; explicit The...