...是為了解釋這個(gè)問題 往下閱讀之前你需要知道,promise的resolve回調(diào)函數(shù)會(huì)被放在job queue中等待主任務(wù)執(zhí)行完畢后等待執(zhí)行(這也是文章提到的問題的解答)??梢詤⒖歼@篇文章 代碼一 new Promise((resolve, reject) => { resolve(); //將resolv...
... 所以它們可以被鏈?zhǔn)秸{(diào)用。 var promise1 = new Promise(function(resolve, reject) { setTimeout(function() { resolve(foo); }, 300); }); promise1.then(function(value) { console.log(value); // expected ...
...MyPromise /* * 這里我將promise的3個(gè)狀態(tài)分別定義為: pending, resolved, rejected * 其中fn必須是個(gè)函數(shù), 必須通過new來使用 */ function MyPromise(fn) { if (!(this instanceof MyPromise)) { throw new TypeError(MyPromise mus...
... // 獲取用戶id function getUserId() { return new Promise(function(resolve, reject) { setTimeout(function() { resolve(186) }, 1e3) }) } // 通過用戶id獲取該用戶的手機(jī)號(hào) function getMobileB...
1.Promise的立即執(zhí)行性 var p = new Promise(function(resolve, reject){ console.log(create a promise); resolve(success); }); console.log(after new Promise); p.then(function(value){ console.log(value); ...
...狀態(tài):Pending(準(zhǔn)備狀態(tài)),F(xiàn)ulfilled(成功狀態(tài),也稱為Resolved狀態(tài)),Rejected(失敗狀態(tài))。只有異步操作的結(jié)果可以決定promise對(duì)象的狀態(tài),操作成功后,promise對(duì)象由Pending狀態(tài)轉(zhuǎn)換為Fulfilled狀態(tài),此時(shí)回調(diào)函數(shù)會(huì)執(zhí)行 onFulfilled...
...冊(cè)多個(gè)處理函數(shù),舉個(gè)栗子,就像這樣 let p1 = new Promise((resolve) => { fs.readFile(./test.js, utf8, (err, data) => { resolve(data) }) }) p1.then(data => console.log(data)) p1.then(data => console.log(data.t...
... make me feel more comfortable. However, sometimes, things are different. RESOLVE and Promise.resolve() Normally, I initialize a promise by Promise.resolve() because it seems too troublesome to ...
...作在 doSomethingFirst 中 const doSomethingFirst = new Promise(function(resolve, reject) { // ... some code if (/*操作成功 */){ resolve(doSomethingFirstValue); //將doSomethingFirst對(duì)象的狀態(tài)從pending...
...個(gè)promise對(duì)象接收的是一個(gè)callback這個(gè)callback接收兩個(gè)參數(shù)(resolve,reject)當(dāng)我們?cè)赾allback內(nèi)執(zhí)行resolve或reject的時(shí)候,就會(huì)調(diào)用Promise內(nèi)定義的 resolve和reject函數(shù)然后,resolve和reject函數(shù)會(huì)改變Promise的狀態(tài)所以它應(yīng)該是像下面這樣的 functi...
...子: function sendRequest(url, param) { return new Promise(function (resolve, reject) { request(url, param, resolve, reject); }); } sendRequest(test.html, ).then(function(data) { ...
...響:Promise 代表的異步操作有三個(gè)狀態(tài): Pending: 進(jìn)行中 Resolved: 已完成(Fulfilled) Rejected: 已失敗 一旦狀態(tài)改變,就不會(huì)再變:Promise 的狀態(tài)只有2種可能: 從 Pending 到 Resolved 從 Pending 到 Rejected 對(duì)于同一個(gè) promise, 當(dāng)以上狀態(tài)...
...方法 參數(shù)onFulfilled,onRejected 分別有自己的參數(shù), 分別是resolve的參數(shù)跟reject的參數(shù) then只能使用前一個(gè)then的返回值 then返回值不能是同一個(gè)promise 來一個(gè)一個(gè)看吧 then是屬于實(shí)例上的方法 Promise.prototype.then = function(){} 參數(shù)有2個(gè),...
...,我們看一下一個(gè)promise的基本用法: var p = new MyPromise((resolve) => { setTimeout(() => { resolve(20) }, 300) }) p.then( (msg) => console.log(msg) ); MyPromise是一個(gè)構(gòu)造函數(shù),這個(gè)構(gòu)造函數(shù)會(huì)被傳遞一個(gè)函數(shù);函數(shù)中有兩個(gè)參數(shù),是兩...
...,我們看一下一個(gè)promise的基本用法: var p = new MyPromise((resolve) => { setTimeout(() => { resolve(20) }, 300) }) p.then( (msg) => console.log(msg) ); MyPromise是一個(gè)構(gòu)造函數(shù),這個(gè)構(gòu)造函數(shù)會(huì)被傳遞一個(gè)函數(shù);函數(shù)中有兩個(gè)參數(shù),是兩...
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