JavaScript?? ??? ??? ?????? ?? \'async\' ? \'await\'? ???? ??? ??????
Oct 19, 2024 pm 10:38 PM
'async' ? 'await'? ??? JavaScript? ??? ??
??? ?????? JavaScript ???? ?? ?????. ??? ??? ???? ??? ?? ??? ???? ?? ??????. ???? ??? ? ???? ???????. ??? ??? ??? "?? ??"?? ??? ? ????.
Promise
Promise? ??? ??? ??? ??? ??????. ?? ? ??? ??? ?? ??? ???? "?? ??"? ?? ??? ???? ???. ?:
<code class="javascript">const randomProm = new Promise((resolve, reject) => {
if (Math.random() > 0.5) {
resolve('Succes');
} else {
reject('Failure');
}
});
// Promise chain
randomProm
.then((value) => {
console.log('inside then1');
console.log(value);
return value;
})
.then((value) => {
console.log('inside then2');
console.log(value);
return value;
})
.catch((value) => {
console.log('inside catch');
console.log(value);
});</code>
'async' ? 'await' ???
"??? ??"??? ??? ??? ??? ??? ?????? ?? ????? ?? ???????. . ??? ???? async ???? ???? ??? wait ??? ??? ?????.
await? ?? ???(????? Promise)? ??? ??? ??? ??? ??? ?? ?????. ???? ???? ??? ?? ?????. ?:
<code class="javascript">async function myAsyncFunc() {
try {
const result = await randomProm;
console.log(result);
} catch (error) {
console.log(error);
}
}
myAsyncFunc();</code>
? ??? myAsyncFunc? RandomProm Promise? ??? ???? ??? ?????. Promise? ????? ???? try/catch ??? ?? ??? ?????. ??? ? ??? ???? ??? ?? ??? ?? ??? ?? ???? ?????.
? ??? JavaScript?? ??? ??? ?????? ?? \'async\' ? \'await\'? ???? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!
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