var fun = ()=>{
return new Promise((resolve,reject) => {
resolve(1)
})
}how can I tell that fun () is a Promise object without running fun and cannot modify the fun function?
var fun = ()=>{
return new Promise((resolve,reject) => {
resolve(1)
})
}how can I tell that fun () is a Promise object without running fun and cannot modify the fun function?
does not execute the function, how is it possible to know what type of return value it is? it is not that java or cPP, can declare the return value of the function in advance
Promise itself to determine whether the return value is Promise by judging whether there is a then
if something looks like a duck and tastes like a duck, then he is a duck
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what does the code circled in the following picture mean? ...
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How does the code return only the result after the last asynchronous operation in the for loop is completed as shown in the figure? Please stop by and give me a hand. ...