https://github.com/postor/async-drop-late
https://github.com/postor/async-drop-late
Last synced: 2 months ago
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- Host: GitHub
- URL: https://github.com/postor/async-drop-late
- Owner: postor
- Created: 2018-08-14T03:03:03.000Z (almost 7 years ago)
- Default Branch: master
- Last Pushed: 2018-08-14T03:48:05.000Z (almost 7 years ago)
- Last Synced: 2025-02-26T04:37:20.214Z (3 months ago)
- Language: JavaScript
- Size: 1000 Bytes
- Stars: 0
- Watchers: 3
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# async-drop-late
有同学在多次ajax的时候遇到了较早的请求后到导致数据不一致的问题，最好的方案当然是数据包含版本，但这个实现就不依赖后端也能确保数据不会被迟到的ajax结果覆盖
sometimes former ajax result may come late and over write the right data with outdated data, this package keeps the secquence, and reject when the former ajax comes late
## usage
```
const dropLate = require('async-drop-late')
//first async, delay 2second, will resolve after second async and get dropped!
dropLate(delay(1500,'first'))
.then((v)=>console.log(`wrong!`,v))
.catch((e)=>console.log(`first async get dropped!`,e))
dropLate(delay(1000,'second'))
.then((v)=>console.log(`second async done`,v))
.catch((e)=>console.log(`wrong!`,e))
dropLate(delay(2000,'third'))
.then((v)=>console.log(`third async done`,v))
.catch((e)=>console.log(`wrong!`,e))
//different key won't mess up
dropLate(delay(500,'fuorth'),'testkey')
.then((v)=>console.log(`fuorth async with another key done`,v))
.catch((e)=>console.log(`wrong!`,e))
function delay(miliseconds,name){
return new Promise((resolve)=>{
setTimeout(()=>resolve(name),miliseconds)
})
}
```