I was following a vue.js tutorial and saw something that confuses me and was wondering if someone can explain it to me since I never use promise. The below method is used to assign a customer array object. Why use a Promise? I thought Promise should be used when you are returning an object to a service consumer? Why and when should I use a promise?
loadCustomer() {
new Promise((resolve, reject) => {
axios.get(this.DetailsDataUrl)
.then(res => {
this.Customer = res.data
resolve()
})
.catch(err => {
console.log(err);
reject()
})
});
}
With promises
you can call asynchronous
functions. eg here when you want to use loadCustomer
you can await
until this function resolve or reject:
try {
// resolve
const response = await loadCustomer()
} catch(err) {
// reject
console.log(err)
}
axios
it self return a promise
: so you can rewrite your function like this:
loadCustoemr() {
return axios.get(this.DetailsDataUrl)
}
and call it:
loadCutomer()
.then(res => this.Customer = res.data)
.catch(err => console.log(err))
as above you can also use async/await
here. for more information you can use this link ,
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.