a mention of performance considerations piqued my curiosity and I decided to do a quick performance test. I used Benchmark.js and tested the results of creating and resolving a deferred object with a success handler in .then().
当objet A和object B都引用自相同的底层数据时，只要你操作object A，就会修改到object B。
代码语言:javascript 复制 constpendingPromises={};functionrequest(type,url,data){// Use the request information as the only request key to cache the promise object being requested//Requests with the same key will reuse promiseconstrequestKey=JSON.stringify([type,url,data]);if(pendingPromises[reques...
https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Promise http://qingtong234.github.io/2016/01/14/javascript%E4%B8%AD%E7%9A%84promise%E5%BC%82%E6%AD%A5%E7%BC%96%E7%A8%8B-1/
requestOtpCode返回一个promise，因为它是一个异步函数。您通过“尝试cathing”axios调用做得很好，但由于...
For more information about promises in JavaScript, see Asynchronous programming in JavaScript.EventsThe Promise object has these events.توسيع الجدول EventDescription onerror Occurs when there is an error in processing a promise....
11. .map(Function mapper [, Object options]) 用于处理一个数组,或者 promise 数组, Option: concurrency 并发现 map(..., {concurrency:1}); 以下为不限制并发数量,读书文件信息 varPromise=require("bluebird");varjoin =Promise.join;varfs =Promise.promisifyAll(require("fs"));varconcurrency =parseFloa...
这些属性定义在 Promise.prototype 上,由所有的 Promise 实例共享。 Promise.prototype.constructor 创建实例对象的构造函数。对于 Promise 实例,初始值为 Promise 构造函数。 Promise.prototype[Symbol.toStringTag] [Symbol.toStringTag] 属性的初始值为字符串 "Promise"。该属性用于 Object.prototype.toString()。实例...
For more information about promises in JavaScript, see Asynchronous programming in JavaScript.EventsThe Promise object has these events.Expand table EventDescription onerror Occurs when there is an error in processing a promise.MethodsThe Promise object has these methods....
Async函数返回,[object Promise]但所需的行为是返回实际值。我可以从console.log. 我想这是该函数的预期行为,但我不知道如何修复我的代码。 这是在使用电子 vue 和 NeDB 的 vue.js 代码中。 <template> <div> {{ testNedb3('NDId6sekw6VYLmnc') //this is a test by adding specific id }} ...