js手写-promise的静态方法
resolve/reject
在之前实现的mypromise基础上
static resolve(value){
return new MyPromise((resolve)=>resolve(value))
}
static reject(reason){
return new MyPromise((resolve,reject)=>reject(reason))
}
}
MyPromise.resolve("成功").then((res) => {
console.log(res);
})
MyPromise.reject("失败").catch((err) => {
console.log(err);
})
all/allSettled
static all(promises){
return new MyPromise((resolve,reject)=>{
//存储遍历的结果
let values = []
promises.forEach((promise)=>{
promise.then(res=>{
//收集所有成功的结果
values.push(res)
//如果全都成功
if(values.length == promises.length)
{
resolve(values)
}
},(err)=>{
//一旦有一个失败就是失败的
reject(err)
})
})
})
}
static allSettled(promises) {
return new MyPromise((resolve, reject) => {
//存储遍历的结果
let values = [];
promises.forEach((promise) => {
promise.then(
(res) => {
//收集所有成功的结果
values.push({
status: "fulfilled",
value: res,
});
if (values.length == promises.length) resolve(values);
},
(err) => {
values.push({
status: "rejected",
value: err,
});
if (values.length == promises.length) resolve(values);
}
);
});
});
}
race/any
static race(promises) {
return new MyPromise((resolve, reject) => {
promises.forEach((promise) => {
promise.then(
(res) => {
resolve(res);
},
(err) => {
reject(err);
}
);
});
});
}
static any(promises) {
return new MyPromise((resolve, reject) => {
const reasons = [];
promises.forEach((promise) => {
promise.then(
(val) => {
resolve(val);
},
(err) => {
reasons.push(err);
if (reasons.length == promises.length) {
reject(new AggregateError(reasons));
}
}
);
});
});
}
原文地址：https://blog.csdn.net/qq_73270720/article/details/145291567
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