Lets say you want to call a function after 1s, 2s, 3s. You can use setTimeout, or you can wrap it up into a simple delay function that works with async/await We want to conver this code const run = (cb) =>{ setTimeout(()=>{ cb('1s'); setTimeout(()=>{ cb('2s'); se...
Lets say you want to call a function after 1s, 2s, 3s. You can use setTimeout, or you can wrap it up into a simple delay function that works with async/await We want to conver this code const run = (cb) =>{ setTimeout(()=>{ cb('1s'); setTimeout(()=>{ cb('2s'); se...
async function makeRequest(url: string, log?: (msg: string) => void) { log?.(`Request started at ${new Date().toISOString()}`); // roughly equivalent to // if (log != null) { // log(`Request started at ${new Date().toISOString()}`); // } const result = (await fetch(...
There’s also optional call, which allows us to conditionally call expressions if they’re not null or undefined. 代码语言:javascript 代码运行次数:0 运行 AI代码解释 async function makeRequest(url: string, log?: (msg: string) => void) { log?.(`Request started at ${new Date().toISOString...
}letres: CallResult = some_api_function('hello','world');if(!res.succeeded()) {console.log('Call failed: '+ res.errorMessage()); } any类型在TypeScript中并不常见,只有大约1%的TypeScript代码库使用。一些代码检查工具(例如ESLint)也制定一系列规则来禁止使用any。因此,虽然禁止any将导致代码重构,...
import { ref } from 'vue' import { getUserList as getUserListApi, type UserItem } from '@/apis' // 同名可以使用别名 const loading = ref(false) const userList = ref<UserItem[]>([]) const getUserList = async () => { try { ...
async function test() { // throw new Error("123"); ---1 可以被捕捉 return new Promise((resolve, reject) => { setTimeout(()=> { //throw new Error("456"); --- 2 不能被捕捉 // reject(new Error("789")); --- 3 可以被捕捉 }, 3000); setTimeout(()=> { resolve(3); ...
Here, TypeScript decided that it wasn’t "safe" to assume thaturlwasactuallyaURLobject in our callback function because it was mutated elsewhere; however, in this instance, that arrow function isalwayscreated after that assignment tourl, and it’s also thelastassignment tourl. ...
首先,C#和Java都使用async/await来处理异步代码。在Java中,异步操作用Promise表示,而应用程序可以await一个异步操作结束。C#中的Promise其实是Task,概念上与Promise完全相同,也有相应的方法。下面的例子演示了两种语言中async/await的用法: async function fetchAndWriteToFile(url: string, filePath:string): Promise<stri...
1.首先，我会按照错误提示来确保您的测试功能正常，即使非常缓慢：