为什么我下面的异步 function 得到错误代码 'Uncaught SyntaxError: Identifier 'message' has already been declared”？

Question

My asynch function is as follows

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 /* async/await */ async function demoPromise() { try { let message = await myPromise; let message = await helloPromise(); console.log(message); } catch ((error) => { console.log("Error:" + error.message); }) } /* call the async function */ (async () => { await myDate(); })();

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The myPromise code block is:

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 const myPromise = new Promise((resolve, reject) => { const condition = true; if (condition) { setTimeout(function() { resolve("Promise is resolved;"), // fulfilled }; 300); } else { reject('Promise is rejected;'); } });

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And the `helloPromise() code block is:-

 const helloPromise = function() { return new Promise(function(resolve, reject) { const message = `Hi, How are you;`; resolve(message) }); }

Answer 1

First of all you cannot declare 2 variables with the same name so either remove let from the 2nd message variable (this will override the promise result though) or give the 2nd message variable another name ex. let anotherMessage = await helloPromise();

Moreover, i think the 1st promise myPromise is missing a () . It should be let message = await myPromise();