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'); ...
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". ...
// 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.cachePromise = caches.open('avatars'); } async getAvatar(name) { ...
async 和 await 在干什么,async 用于声明一个 function 是异步的,而 await 可以认为是 async wait 的简写, 等待一个异步方法执行完成。 2.2 基本语法 asyncfunctiondemo(params) { }demo(); async 函数返回的是一个 Promise 对象。 必须了解的 asyncFunction console.log(asyncfunction(){}.constructor); 在Chro...
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) { ...
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>)...
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 ...
{ 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...
AsyncResource { constructor() { super('my-resource'); } close() { this.emitDestroy(); } } function p() { return new Promise(r => { setTimeout(() => { r() }, 1000) }) } let resource = new MyResource; resource.runInAsyncScope(async () => { console.log('hello') await ...
privatemMember:Something;constructor() {this.mMember=awaitSomeFunctionAsync();// error} } Becomes: classMyClass{ privatemMember:Something;// make private if possible; I can't in TS 1.8constructor() { } publicstaticCreateAsync=async() => {constme =newMyClass(); ...