Usecallbackto Wait for a Function to Finish in JavaScript If we have synchronous statements, then executing those statements after each other is straight forward. functionone(){console.log('I am function One');}functionTwo(){console.log('I am function Two');}one();Two(); ...
How to wait for a function to finish in javascript? To wait for a function to finish in JavaScript, use async/await or Promises. Wrap the function call in an async function and await its completion. This ensures sequential execution. However, keep in mind that waiting too long can impact ...
async function myfunction() { console.log('Inside of myfunction'); } // Here we wait for the myfunction to finish // and then returns a promise that'll be waited for aswell // It's useless to wait the myfunction to finish before to return // we can simply returns a promise that...
function longRunningTask() { // do something that takes a long time } longRunningTask(); updateUI(); // this has to wait for longRunningTask to finish 在这个例子中,updateUI函数需要等待longRunningTask函数完成才能开始。这可能会导致用户界面冻结,给用户带来不好的体验。 一个更好的做法是使用Web Work...
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5. setTimeout(function cb1() { ... }) 添加到调用堆栈。 6. setTimeout(function cb1() { ... }) 执行,浏览器创建一个计时器计时,这个作为Web api的一部分。 7. setTimeout(function cb1() { ... })本身执行完成,并从调用堆栈中删除。
async function loadData() { try { var data = JSON.parse(await getJSON()); console.log(data); } catch(e) { console.log(e); } } 3. 条件 用async/ wait编写条件代码要简单得多: function loadData() { return getJSON() .then(function(response) { if (response.needsAnotherRequest) { ...
}functiongetUsername(person) {returnperson.username; }asyncfunctionchainedFetchMessages(p, username) {// In this function, p is a promise. We wait for it to finish,// then run fetchMessages().constobj =awaitp;constdata =awaitfetchMessages(username);return{ ...obj, [username]: data}; ...
function getUsername(person) { return person.username; } async function chainedFetchMessages(p, username) { // In this function, p is a promise. We wait for it to finish, // then run fetchMessages(). const obj = await p; const data = await fetchMessages(username); ...
}functiongetUsername(person) {returnperson.username; } asyncfunctionchainedFetchMessages(p, username) {//In this function, p is a promise. We wait for it to finish,//then run fetchMessages().const obj =await p; const data=await fetchMessages(username);return{ ...obj, [username]: data}...