/** * 等待指定的时间/等待指定表达式成立 * 如果未指定等待条件则立刻执行 * @param {Number|Function} [param] 等待时间/等待条件 * @returns {Promise} Promise 对象 */ export const wait = param => { return new Promise(resolve => { if (typeof param === 'number') { setTimeout(resolve, ...
ThePromise.allSettled()method is useful when you want to wait for multiple promises to settle, no matter whether they'll be fulfilled or rejected. First thing first, let's understand what is promise state: 'Settled' means both 'Resolved' or 'Rejected'. So in most cases, Promise.settled()...
Promise.allSettled({}) It will throw error. Because {} is not iterable. Why we need to use Promise.allSettled()? Remeber Promise.all([..]), one promise rejected will cause the whole Promise get rejected. It is always a problem which cause a not user-friendly case. Promise.allSettled([...
let promise = new Promise(function(resolve, reject) { }); 对于一个任务来说,任务最终状态有两种: 一种是执行成功、一种是执行失败。参数resolve和reject是由JavaScript自身提供的回调,是两个函数, 由 JavaScript 引擎预先定义,因此我们只需要在任务的成功的时候调用resolve,失败的时候reject即可。注意任务的最终状...
promise和setTimeout的执行顺序问题? 1、执行new Promise,执行setTimeout,将里面代码加入宏任务2、执行promise.then,promise状态还未改变,所以还没把then回调加入微任务3、执行setTimeout代码,执行resolve(1),把then回调加入微任务,执行console.log("2");,打印24、执行console.log(res);,打印1 ...
javaScriptwait如何使用 js await执行顺序 1.js的执行顺序,先同步后异步2.异步中任务队列的执行顺序: 先微任务microtask队列,再宏任务macrotask队列3.调用Promise 中的resolve,reject属于微任务队列,setTimeout属于宏任务队列注意以上都是 队列,先进先出。 微任务包括 `process.nextTick` ,`promise` ,`MutationObserver`...
return new Promise(resolve => setTimeout(resolve, ms)) } await sleep(1000) await submitHandler() await childRef.current.upload() } //I want to wait for onSubmit to complete and then call another function which sets state and then launches a modal ...
methods: { fetchDataFromApi: waitFor('fetch data', async function () { function sleep(ms) { return new Promise(resolve => setTimeout(resolve, ms)); } // do work here await sleep(3000); // simulate some api call this.fetchResponse = Math.random() }) } ......
A simple implementation of Promise is given below. In this example, we are trying to mimic a scenario for comparing the actual page title with the expected page title and seeing whether they match. Based on the status, resolve() or reject() gets invoked, and an appropriate message gets log...
methods: { fetchDataFromApi: waitFor('fetch data', async function () { function sleep(ms) { return new Promise(resolve => setTimeout(resolve, ms)); } // do work here await sleep(3000); // simulate some api call this.fetchResponse = Math.random() }) } ......