idCount: number = 0; constructor() { this.keys = []; this.hasLock = false; this.idCount = 0; } _pushKey(resolve: Resolve) { this.idCount += 1; const key: Key = { key: this.idCount, resolve, }; this.keys.push(key); return key; } _removeKey(key: Key) { const index =...
class Storage { constructor() { this.cachePromise = caches.open('avatars'); } async getAvatar(name) { const cache = await this.cachePromise; return cache.match(`/avatars/${name}.jpg`); } } const storage = new Storage(); storage.getAvatar('jake').then(…); // 箭头函数 const foo ...
行{4} 拿到 asyncId 获取当前代码的上下文信息。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 // AsyncLocalStorage.jsconstasyncHooks=require('async_hooks');const{executionAsyncId}=asyncHooks;classAsyncLocalStorage{constructor(){this.storeMap=newMap();// {1}this.createHook();// {2}}create...
npm install --save async-constructor#oryarn add async-constructor Usage This module is created forTypeScript, but can also be used inJavaScript. JavaScript You may not need the module because JavaScript constructor could return aPromise<this>: ...
constructor() {this.cachePromise = caches.open('avatars'); } async getAvatar(name) {constcache = awaitthis.cachePromise;returncache.match(`/avatars/${name}.jpg`); } }conststorage =newStorage(); storage.getAvatar('jake').then(…);//箭头函数constfoo = async () => {}; ...
constructor(){ this.cachePromise=caches.open('avatars'); } async getAvatar(name){ const cache=awaitthis.cachePromise; returncache.match(`/avatars/${name}.jpg`); } } const storage=newStorage(); storage.getAvatar('jake').then(…); ...
prototype.toString.call(fn) === '[object AsyncFunction]' || fn.constructor.name === 'Asy...
constructor(timeout){ this.timeout = timeout; } then(resolve,reject){ const startTime = Date.now(); setTimeout( ()=>resolve(Date.now()-startTime), this.timeout ); } } (async ()=>{ const sleep = await new Sleep(1000);
在早期的JavaScript中,只支持定义回调函数来表明异步操作完成。串联多个异步操作是一个常见的问题,通常需要深度嵌套的回调函数(”回调地狱“)来解决。 setTimeout可以定义一个在指定时间之后会被调度执行的回调函数。 functiondouble(value) {setTimeout(() =>setTimeout(console.log,0, value *2),1000); ...
代码语言:javascript 代码运行次数:0 复制Cloud Studio 代码运行 // 函数声明 async function foo() {} // 函数表达式 const foo = async function () {}; // 对象的方法 let obj = { async foo() {} }; obj.foo().then(...) // Class 的方法 class Storage { constructor() { this.cachePromis...