class Example { constructor(data) { this.data = data; } static async create() { const data = await fetchData(); // 异步获取数据 return new Example(data); } } // 使用方式 Example.create().then((exampleInstance) => { // 使用异步初始化的类实例 });5...
async函数返回的是一个Promise对象。 async 和 await 配合能够让我们感受到改写法的简单明了。下边我们具体看看其中的知识点。 知识点1:用 async 关键字声明的函数返回的是一个 Promise 对象。如果在函数中 return 一个直接量,async 会把这个直接量通过 Promise.resolve() 封装成 Promise 对象。当 async 函数没有...
classApi{ constructor() {} asyncgetHotelModeStatus() {// 无需传递参数 returnawaitcallHotel("EW_HOTEL_MODE_Get");// 默认参数methed的值EW_HOTEL_MODE_Get } asyncsetHotelModeStatus(value) {// 只需传递一个参数 returnawaitcallHotel("EW_HOTEL_MODE_Set", value);// 默认参数methed的值EW_HOTEL...
// AsyncLocalStorage.jsconstasyncHooks=require('async_hooks');const{executionAsyncId}=asyncHooks;classAsyncLocalStorage{constructor(){this.storeMap=newMap();// {1}this.createHook();// {2}}createHook(){constctx=this;consthooks=asyncHooks.createHook({init(asyncId,type,triggerAsyncId){if(ctx.s...
在class中使用async函数的一个常见用例是在构造函数中执行异步操作,例如获取初始化数据。我们可以在构造函数中使用一个立即执行的async函数来实现这一点,例如: javascript class MyClass { constructor() { (async () => { const data = await fetchData(); console.log(data); })(); } } const myInstance...
1 env中的AsyncHooks 在Node.js的env对象中有一个AsyncHooks对象,负责Node.js进程中async_hooks的管理。我们看一下定义。 1.1 类定义 代码语言:javascript 代码运行次数:0 运行 AI代码解释 class AsyncHooks : public MemoryRetainer { public: enum Fields { // 五种钩子 kInit, kBefore, kAfter, kDestroy, ...
Default constructor, initializes a new instance of this class. JSContext(IntPtr) A constructor used when creating managed representations of unmanaged objects; Called by the runtime. JSContext(JSVirtualMachine) JSContext(NSObjectFlag) Constructor to call on derived classes to skip initialization...
class InvokerChannel extends BaseInvokerChannel { constructor() { super(); this._onProcessMessage = this.onProcessMessage.bind(this); process.on('message', this._onProcessMessage); } onProcessMessage(packet) { if (packet.type !== messageType) { ...
Default constructor, initializes a new instance of this class. JSContext(IntPtr) A constructor used when creating managed representations of unmanaged objects; Called by the runtime. JSContext(JSVirtualMachine) JSContext(NSObjectFlag) Constructor to call on derived classes to skip initialization...
Error:Class constructor Button cannot be invoked without 'new' dknutsenApril 30, 2021, 2:44pm3 The newest version of ember-bootstrap is using native class syntaxfor bs-button. If you’re on a new enough version of Ember you should change your component to native class synt...