Refer to await to JS to write an await error handling

nameIsZoe27 2021-05-03 19:19:27
refer await js write await


Preface

I came across a await Third party error handling npm package await-to-js Then I looked at the source code It's not difficult. I wrote a corresponding js, And used in the last iteration of the current company's project , Let's drag it down to today to share

Why do you need to do await Error handling of

When the project is complex enough Usually a async There are many... In the method await If await If you don't catch the error, it will lead to the whole async The interruption of a function , This leads to page data errors , The display in front of users is the white screen

  1. Take up a Page component initialization ( such as :componentDidMount) When it's time to init A lot of data
  • Get initialization filter Conditions
  • Get a permission status
  • Get the data list
async componentDidMount(){
// If getFilter Something went wrong inside So the whole async It was interrupted
await getFilter()
await getSomeAuth()
await getSomeList()
}
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General error capture processing

try{
await getFilter()
}catch(err){
throw new Error(err)
}
try{
await getSomeAuth()
}catch(err){
throw new Error(err)
}
try{
await getSomeList()
}catch(err){
throw new Error(err)
}
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  • Write here Maybe a little friend will ask why not use one try,catch The parcel , But with one try,catch We don't know exactly which await Something went wrong

Combined with the current project axios Encapsulation Conduct await Error trapping

  1. axios The secondary packaging position of
  2. util.js Encapsulation
export function to(promise: Promise<unknown>) {
// await Back The interface function we encapsulate is a promise Then it can be called by chaining catch and then
return promise
.then((result) => {
// When executed correctly Returns an array ,err It's empty ,result Is the success return value
return [null, result]
})
//await When it's wrong Only the corresponding error is returned
.catch((err) => [err])
}
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3. call

// path alias webpck Do the corresponding configuration in
import {testApi} from '@api'
import { to } from '@util'
async componentDidMount(){
const [err,result] await getFilter()
if(err){
console.log(`getFilter ${err}`)
return
}
const {success, data,msg}=result
if(!success){
// there msg Usually Validation error returned by backend , For details, see axios Encapsulation
console.log(msg)
return
}
console.log({data})
// getSomeAuth() and getSomeList() The same can be
}
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Summary

If the content of this article has a certain reference value for your study or work , Remember to praise San Lian Thank you very much. ! If you have any questions, you can leave a message

版权声明
本文为[nameIsZoe27]所创,转载请带上原文链接,感谢
https://qdmana.com/2021/05/20210503191542556Q.html

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