js then
doSomething()
.then(function(result) {
return doSomethingElse(result);
})
.catch(failureCallback);js then
doSomething()
.then(function(result) {
return doSomethingElse(result);
})
.catch(failureCallback);promise catch
//create a Promise
var p1 = new Promise(function(resolve, reject) {
resolve("Success");
});
//Execute the body of the promise which call resolve
//So it execute then, inside then there's a throw
//that get capture by catch
p1.then(function(value) {
console.log(value); // "Success!"
throw "oh, no!";
}).catch(function(e) {
console.log(e); // "oh, no!"
});then js
new Promise( (res, rej) => {
setTimeout(() => res(1), 1000);
}).then( (res) => {
console.log(res); // 1
return res*2
}).then( (res) => {
console.log(res); // 2
});.then javascript
const promise2 = doSomething().then(successCallback, failureCallback);js return a promise
function myAsyncFunction(url) {
return new Promise((resolve, reject) => {
const xhr = new XMLHttpRequest();
xhr.open("GET", url);
xhr.onload = () => resolve(xhr.responseText);
xhr.onerror = () => reject(xhr.statusText);
xhr.send();
});
}Copyright © 2021 Codeinu
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