Promise的幾個擴充套件API總結

和 promise.all 相反，當所有的promise被拒絕之後，none方法執行完成的決議，如果存在乙個promise執行完成的決議，none方法則執行拒絕

promise.none = function(promises) )

}))}

const promisesfornonetest1= [

promise.reject('1'),
promise.reject('2'),
promise.resolve('3'),
promise.reject('4'),
] promise.none(promisesfornonetest1).then(res => , res => )
const promisesfornonetest2= [
promise.reject('1'),
promise.reject('2'),
promise.reject('3'),
promise.reject('4'),
] promise.none(promisesfornonetest2).then(res => , res => )

promise.any = function(promises) , () => ) 

})).then(() => )
})}

const promisesforanytest1= [

promise.reject('1'),
promise.resolve('2'),
promise.reject('3'),
promise.resolve('4'),
promise.resolve('5'),
] promise.any(promisesforanytest1).then(res => , res => )
const promisesforanytest2= [
promise.reject('1'),
promise.reject('2'),
promise.reject('3'),
promise.reject('4'),
promise.reject('5'),
] promise.any(promisesforanytest2).then(res => , res => )

promise.first = function(promises) 

})})
})}

const promisesforfirsttest1= [

promise.reject('1'),
promise.resolve('2'),
promise.reject('3'),
promise.resolve('4'),
] promise.first(promisesforfirsttest1).then(res => , res => )
const promisesforfirsttest2= [
promise.reject('1'),
promise.resolve('2'),
promise.reject('3'),
promise.resolve('4'),
] promise.first(promisesforfirsttest2).then(res => , res => )

promise.map方法希望實現乙個處理批量非同步操作的並行迭代方法，本質上是利用promise.all進行二次封裝

promise.map = function(promises, resolvecallback, rejectcallback) , error => )

}))}

const promisesformaptest1= [

promise.resolve('1'),
promise.resolve('2'),
promise.resolve('3'),
promise.resolve('4'),
] promise.map(promisesformaptest1, result => , result => ).then(res => , res => )
const promisesformaptest2= [
promise.resolve('1'),
promise.resolve('2'),
promise.reject('3'),
promise.resolve('4'),
] promise.map(promisesformaptest2, result => , result => ).then(res => , res => )

Promise的幾個擴充套件API總結

和 promise.all 相反，當所有的promise被拒絕之後，none方法執行完成的決議，如果存在乙個promise執行完成的決議，none方法則執行拒絕 promise.none function promises const promisesfornonetest1 promise.rej...

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promise 靜態方法 allsettled 返回結果是個物件陣列，物件陣列中值的順序和傳入promise時的順序一致。返回所有promise的執行結果，只能在then中獲取，不執行catch。每個物件包含 status promise狀態 value promise執行成功的結果 reason ...