先说一下async的用法,它作为一个关键字放到函数前面,用于表示函数是一个异步函数,因为async就是异步的意思, 异步函数也就意味着该函数的执行不会阻塞后面代码的执行。 原来async 函数返回的是一个promise 对象 AI检测代码解析 async function timeOut() { return 'hello world' } // console.log(timeOut()); ...
1、首先定义 module 文件:bbb.js# Copy constfs =require("fs");functionreadFileSync() {letresult = fs.readFileSync("./result.log");returnresult; }asyncfunctionreadFileAsync() {letresult =awaitnewPromise((resolve, reject) =>{ fs.readFile("./result.log",(err, data) =>{if(err)reject(...
react export async function逆向传值在React中,逆向传值通常指的是父组件向子组件传递数据,而不是子组件向父组件传递数据。如果你想从子组件向父组件传递数据,你可以使用回调函数或者使用状态钩子(useState)来实现。 下面是一个使用回调函数实现逆向传值的示例: jsx import React, { useState } from 'react'; ...
import 'https://mozilla.github.io/pdf.js/build/pdf.mjs'; export async function pdfToImages(b64, url) { var { pdfjsLib } = globalThis; pdfjsLib.GlobalWorkerOptions.workerSrc = '//mozilla.github.io/pdf.js/build/pdf.worker.mjs'; var images = []; let currPage = 1; var loadingTask...
JS export 异步导出 function getUrl () { req().then(res => { console.log(res); }).catch(err => { console.log(err); }) } export async function myReq() { await getUrl(); return '123'; }
exportfunctiongetMessage(){return'Olá do Blazor!'; }exportasyncfunctionsetMessage(){const{ getAssemblyExports } =awaitglobalThis.getDotnetRuntime(0);varexports =awaitgetAssemblyExports("BlazorSample.dll");document.getElementById("result").innerText = exports.BlazorSample.JavaScriptInter...
export async function fetchData() { try { const response = await fetch(' const data = await response.json(); return data; } catch (error) { console.error('Error fetching data:', error); throw error; } } ``` 在外部模块中,我们可以以同步的方式引入并调用这个异步函数: ```javascript imp...
"export default async function" adds an unnecessary parenthesis around the entire function: export default async function foo() { console.log('Hello, World'); } turns into: export default (async function foo() { console.log("Hello, World...
}// 匿名函数export async function getBooks() {}// 类export class Book { constructor(name, author) { this.name = name this.author = author } }// 实例化类export const book = new Book('Lord of the Rings', 'J. R. R. Tolkein') ...
export function difference(x, y) { return x - y } // 匿名函数 export async function getBooks() {} // 类 export class Book { constructor(name, author) { = name this.author = author } } // 实例化类 export const book = new Book('Lord of the Rings', 'J. R. R. Tolkein') ...