Javascript Async, Await 심화

# Javascript Async, Await 심화 ```javascript // wait ms milliseconds function wait(ms) { return new Promise(r => setTimeout(r, ms)); } async function hello() { await wait(1500); return 'world'; } hello() .then(function(r,j){ console.info(r,j); }) .catch(function(e){ console.info(e); }); // ==== ==== ==== ==== ==== ==== ==== ==== ==== ==== ==== // wait ms milliseconds function wait(ms) { return new Promise(r => setTimeout(r, ms)); } async function foo() { // await wait(500); throw Error('bar'); } async function foo() { // await wait(500); throw {"aError":"aError"} } foo() .then(function(r,j){ console.info(r,j); }) .catch(function(e){ console.info(e); }); ```