AsyncFunction.lengthAsyncFunction构造函数的 length 属性,值为 1。AsyncFunction.prototype通过原型对象可以为所有异步函数对象定义额外的属性。 AsyncFunction原型对象 属性 AsyncFunction.constructor默认值为AsyncFunction.AsyncFunction.prototype[@@toStringTag]Returns "AsyncFunction". ...
const readFile=function(fileName){ returnnewPromise(function(resolve,reject){ fs.readFile(fileName,function(error,data){ if(error)returnreject(error); resolve(data); }); }); }; const gen=function*(){ const f1=yield readFile('/etc/fstab'); ...
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.cachePromise = caches.open('avatars'); } async getAvatar(name) { const cache =...
The multiple async constructors will be called in order, and always called after all sync constructor. mixinAsyncConstructor functionmixinAsyncConstructor<BaseextendsConstructor>(base:Base,asyncConstructor:(...args:ConstructorParameters<Base>)=>PromiseLike<void>):new(...args:ConstructorParameters<Base>)...
{PORT}`));asyncfunctiongetUsersController(){logger.info('Get user list at controller layer.');returngetUsersService();}asyncfunctiongetUsersService(){logger.info('Get user list at service layer.');setTimeout(function(){logger.info('setTimeout 2s at service layer.')},3000);returngetUsers...
function Promise(executor) { let self = this; self.status = 'pending'; self.value = undefined; self.reason = undefined; self.onFulfilledCallbacks = []; self.onRejectedCallbacks = []; function resolve(value) { if (self.status === 'pending') { self.status = 'fulfilled'; self.value = ...
console.log(async function(){}.constructor); ƒ AsyncFunction() { [native code] } 2.3 规则 async 表示这是一个 async 函数, await 只能用在这个函数里面。 await 表示在这里等待 promise 返回结果后,再继续执行。 await 后面跟着的应该是一个 promise 对象(当然,其他返回值也没关系,只是会立即执行,不过...
async function one2FiveInAsync() { for(let i = 1; i <= 5; i++) { console.log(i); await sleep(1000); } } one2FiveInAsync(); 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 任何一个await语句后面的 Promise 对象变为reject状态,那么整个async函数都会中断执行。
{ storageList[i]._propagate(resource, currentResource); } }});classAsyncLocalStorage{constructor() {this.kResourceStore = Symbol('kResourceStore');this.enabled = false; } disable() {if (this.enabled) {this.enabled = false;// If this.enabled, the instance must be in storageLis...
const foo = async function () {};// 函数表达式 let obj = { async foo() {} }; obj.foo().then(...)// 对象的方法 class Foo {// Class 的方法 constructor() { } async foo(name) { } } const foo = async () => {};// 箭头函数 ...