自定義實現Promise

promise是很重要的知識點，必須牢記於心,下面是自定義實現的promise：

class

mypromise
catch
(error)}
//成功時
resolve
(value))}
)}}//失敗時
reject
(reason))}
)}}then
(onresolve, onrejected)
)// p.then().then(value=>console.log(value)) //=>成功if(
typeof onresolve !==
"function")if
(typeof onrejected !==
"function"
)//返回的是mypromise物件
let promise =
newmypromise
((resolve, reject)
=>if(
this
.status === mypromise.
rejected
)// 如果resolve()是在settimeout()中進行的
// 如 let p = new promise((resolve, reject) => , 100);
// })
// p.then(value => console.log(value)) //=>成功
//需要把當前需要進行的函式儲存下來if(
this
.status === mypromise.
pending),
onrejected: value =>})
}})return promise;
}parse
(promise, result, resolve, reject)
try,
//     reason => 
// )
//等於下面
result.
then
(resolve, reject);}
else
}catch
(error)}
)}static
resolve
(value)
else})
}static
reject
(value)
else})
}//當所有的promise都成功返回時才返回
static
all(promises)},
reason =>)}
)});
}//當有乙個promise成功返回時便返回這個promise
static
race
(promises)
,                    reason =>)}
)});
}}

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