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→Promise
==Promise==
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise
*非同期の作業を抽象化して、それらを組み立てたり順番に並べる方法
import { isNumber } from "util";
function getPromise(waittime:string): Promise<string> {
return new Promise<string>((resolve, reject) => {
if (isNumber(Number(waittime)) ) {
const wt = parseInt(waittime);
setTimeout(() => {
resolve(`WAIT ${wt}`);
}, wt);
} else {
reject("error");
}
});
}
function usePromise() {
getPromise("2000")
.then((v) => {
console.log(v);
})
.catch((e) => {
console.log(e);
})
}
usePromise();
*結果
WAIT 2000
==async , await==
© 2006 矢木浩人
