[js] 第410天 js循环中调用异步的方法，如何确保执行结果的顺序是正确的？ #2446
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js
JavaScript
Comments
|
An example: let searchApi = function(arg){
return new Promise((resolve,reject)=>{
setTimeout(()=>{
console.log(arg)
resolve(arg)
}, 20)
})
};
let fields = [1,2,3,4];
let arr = new Array(fields.length);
await fields.forEach(async (vvv, index) => {
const obj = await searchApi(vvv)
arr[index] = obj
const tempArr = JSON.parse(JSON.stringify(arr))
if(tempArr.every(Boolean)){
console.log(arr)
}
}) |
|
Promise.all? |
function getPromise(time) {
return new Promise(function (resolve, reject) {
setTimeout(()=>{
resolve(time)
}, time)
})
}
let times = [2000, 5000, 3000, 6000]
async function fn(arr) {
for(const times of arr) {
const res = await getPromise(times)
console.log('fn------', res)
}
}
fn(times) |
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第410天 js循环中调用异步的方法，如何确保执行结果的顺序是正确的？
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我也要出题
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