What Is a Promise? Future Value Values Now and Later Promise Value Completion Event Promise “Events” What Is a Promise? When developers decide to learn a new technology or...

Promise Basics The Promise Lifecycle Creating Unsettled Promises Creating Settled Promises Using Promise.resolve() Using Promise.reject() Non-Promise Thenables Executor Error...

Protocol Compatibility Promise Protocol Compatibility Table Protocol Compatibility Promise We expect Consul to run in large clusters of long-running agents. Because safely upgr...

Protocol Compatibility Promise Protocol Compatibility Table Protocol Compatibility Promise We expect Consul to run in large clusters of long-running agents. Because safely upgr...

Promise.all Promise.allSettled Polyfill Promise.race Promise.resolve/reject Promise.resolve Promise.reject 总结 在 Promise 类中，有 5 种静态方法。我们在这里简单介绍下它们的使用场景。 Promise.all 假设我...

Promise Patterns Promise.all([ .. ]) Promise.race([ .. ]) Timeout Race “Finally” Variations on all([ .. ]) and race([ .. ]) Concurrent Iterations Promise Patterns We’ve a...

Promise Limitations Sequence Error Handling Single Value Splitting Values Unwrap/Spread Arguments Single Resolution Inertia Promise Uncancelable Promise Performance Pro...

Promise 对象 概述 Promise 对象的状态 Promise 构造函数 Promise.prototype.then() then() 用法辨析 实例：图片加载 小结 微任务 参考链接 Promise 对象 概述 Promise 对象是 JavaScript 的异步操作解决方案，为异步操作提供统一接口。它起到代理作用（...

Promise Promise 在JavaScript的世界中，所有代码都是单线程执行的。 由于这个“缺陷”，导致JavaScript的所有网络操作，浏览器事件，都必须是异步执行。异步执行可以用回调函数实现： function callback () { console . log ( 'Done' ); } conso...

Promise实战 具体实现的库 Polyfill 扩展类库 编写Promise代码 创建流程 创建Promise对象 Thenable Promise.reject Promise的同步or异步调用 Promise#catch Promise chain 多个Promise对象完成后统一处理 通过回调方式来进行多个异步调用 使用Pr...