1.函数前面加上 async 关键字，则该函数会返回一个结果为 promise 的对象。2. async 函数返回 promise 对象的状态。2.1：如果返回的是一个非 Promise 类型的数据， 则async 函数返回 promise 的状态 为 fulfilled 成功。2.2：如果返回的是一个 Promise对象，则 async 函数返回 promise 的状态由返回的Promise对...
继续执行,打印console.log( 'script end' ) 外部同步代码执行完毕,接着回到async1()内部, 由于async2()其实是返回一个Promise,await async2()相当于获取它的值,其实就相当于这段代码Promise.resolve(undefined).then((undefined) => {}),所以.then会被推入微任务队列, 所以现在微任务队列会有两个任务。接下来...
async 是异步的意思,await则可以理解为 async wait。所以可以理解async就是用来声明一个异步方法,而 await是用来等待异步方法执行 async和await是es7提供的语法,相比于es6的promise ,具有更高的代码可读性 从字面意思理解async是异步的意思,await是等待的意思,那么他们的作用就很容易看出了: async : 声明一个函数是异...
2.执行 async1 函数: log 'async1 start' 3.执行 async2 函数: log 'aync2 start' 【microTask: log 'async2 end'】 注意!此时 async2 函数还未全部执行完,还有一步停止上下文的操作,所以此时 async1 函数中 await 下面的代码还没到推入微队列的时机 4.执行 setTimeout 函数:回调函数注册到 macroTask ...
Going Async With ES6 Generators Getting Concurrent With ES6 Generators 这四篇是一个系列,把 generator 讲解得算是很透彻了。 归纳起来 generator 函数具有以下特点: 函数可暂停和继续; 可返回多个值给外部; 在继续的时候,外面也可以再传入值; 通过Generator 写的异步代码看起来就像是同步的; ...
With async generators, you can go one step further: They can be the source of an async iterable. Or they can transform an async iterable (as both sink and source). The latter works as follows. The async generator:Consumes an async iterable via for-await-of. Returns an async iterable ...
Optionally, we can transform further, by using more async generators. At the end, we have several options for handling the async iterable returned by the last generator: We can convert it to a readable stream via Readable.from() (which can later be piped into a writable stream). We can...
Likeco,asyncawaitcan suspend a running function without blocking Node's event loop. Both libraries are built oncoroutines, but use different technologies.cousesES6 generators, which work in Node >= v0.11.2 (with the--harmonyflag), and will hopefully be supported someday by all popular JavaScri...
Node.js - Loop through an array to execute asynchronous actions on each element. - nathan818fr/async-loop
loopback-vue loopback+vue+vue-resource,ionic-app,vue page 分页功能,authenticate 权限控制,accesstoken 机制,credentials,CI,docker qxl1231 vue-s3-dropzone A Vue.js drag-and-drop component uploads files to AWS S3 serverlessly easy-vue a easy example using the vue to implement easy web with vue...