return 来自箭头函数的变量 [JS]
return variables from arrow function [JS]
我有这个函数 getData,它将从 JSON 文件中读取 ID 列表。 ID 列表存储在 idsList 变量中,我需要在另一个函数中使用它。我如何 return 这个函数的值
function getData(){
fetch("JSONitemIDsList.json")
.then(response => response.json())
.then(data => {
let idsList = data.ids
//return idsList
})
}
function myFunc(idsList) {
//do something with idsList
}
您可以通过多种方式解决这个问题。例如:
// with async / await
async function getData() {
try {
const rawData = await fetch("JSONitemIDsList.json")
const data = await rawData.json()
return data
} catch (err) {
// handle error here
console.log(err)
}
}
async function myFunc() {
const idsList = await getData()
//do something with idsList
}
或
// define first
function myFunc(idsList) {
//do something with idsList
}
function getData(){
fetch("JSONitemIDsList.json")
.then(response => response.json())
.then(data => {
// function call
myFunc(data.ids)
})
}
你可以试试这个:
const reqResponse = fetch("JSONitemIDsList.json")
.then(response => response.json())
// I am not sure, if your data is already in the format that you need, otherwise, you can run one more .then() to format it
}
const getIdList= async () => {
const idList = await reqResponse;
console.log(idList)
// use idList to access the information you need
}
我有这个函数 getData,它将从 JSON 文件中读取 ID 列表。 ID 列表存储在 idsList 变量中,我需要在另一个函数中使用它。我如何 return 这个函数的值
function getData(){
fetch("JSONitemIDsList.json")
.then(response => response.json())
.then(data => {
let idsList = data.ids
//return idsList
})
}
function myFunc(idsList) {
//do something with idsList
}
您可以通过多种方式解决这个问题。例如:
// with async / await
async function getData() {
try {
const rawData = await fetch("JSONitemIDsList.json")
const data = await rawData.json()
return data
} catch (err) {
// handle error here
console.log(err)
}
}
async function myFunc() {
const idsList = await getData()
//do something with idsList
}
或
// define first
function myFunc(idsList) {
//do something with idsList
}
function getData(){
fetch("JSONitemIDsList.json")
.then(response => response.json())
.then(data => {
// function call
myFunc(data.ids)
})
}
你可以试试这个:
const reqResponse = fetch("JSONitemIDsList.json")
.then(response => response.json())
// I am not sure, if your data is already in the format that you need, otherwise, you can run one more .then() to format it
}
const getIdList= async () => {
const idList = await reqResponse;
console.log(idList)
// use idList to access the information you need
}