# Preface
This tutorial is based on the "apifm-wxapi" module and teaches you how to quickly implement small program development, so you may need to understand the following knowledge points first:
["Creating HelloWorld Project"](https://www.yuque.com/apifm/doc/hezlrm)
["Use "apifm-wxapi" to quickly develop small programs"](https://www.yuque.com/apifm/doc/mdldsd)
["Register for free to open the backend and obtain an exclusive domain name"](https://www.yuque.com/apifm/doc/qr6l4m)
# Requirements description
Configure some parameters in the background (text parameters, switch values, file download addresses, etc.);
The applet can directly read these configurations;
Later, as long as the background parameters are changed, there is no need to modify the applet code, and the latest configuration data can be automatically read;
# budget
0 yuan, free implementation
# Requirements realization
### Enable system parameter setting module
Log in to the "First Step" registration background, left menu --> Factory settings --> Module management
Find the "System Parameter Settings" module, click "Enable Module", then F5 to refresh the background interface, you will see the new menu: "System Settings" --> "System Parameters";
### Write small program code:
##### Can read the current background level
```plain
const WXAPI = require('apifm-wxapi')
WXAPI.init('gooking')
Page({
data: {
},
onLoad: function (options) {
// Read the type of current backend (free backend, professional version, value-added version)
WXAPI.vipLevel().then(res => {
console.log('Merchant type:', res)
})
}
})
```
> WXAPI.init('gooking') This code links your mini program to your backend, where gooking is your exclusive domain name (please check the chapter about exclusive domain names in the preface);
>
Value of _res.data: 0 = Free backend; 1= Professional version; 2= Value-added version_
##### Read a single system parameter
```plain
const WXAPI = require('apifm-wxapi')
WXAPI.init('gooking')
Page({
data: {
},
onLoad: function (options) {
//Read a single system parameter
WXAPI.queryConfigValue('test1').then(res => {
console.log('Parameters read:', res)
})
}
})
```
> WXAPI.init('gooking') This code links your mini program to your backend, where gooking is your exclusive domain name (please check the chapter about exclusive domain names in the preface);
>
**Screenshot of background parameter settings**
##### Read multiple system parameters in batches
```plain
const WXAPI = require('apifm-wxapi')
WXAPI.init('gooking')
Page({
data: {
},
onLoad: function (options) {
//Read a single system parameter
WXAPI.queryConfigBatch('test1,test').then(res => {
console.log('Parameters read:', res)
})
}
})
```
> WXAPI.init('gooking') This code links your mini program to your backend, where gooking is your exclusive domain name (please check the chapter about exclusive domain names in the preface);
>
_Multiple parameter numbers to be obtained can be easily separated in English_
_The batch reading method reads an array of multiple system parameter configurations, and you can process it according to specific needs_
Looking forward to your progress!
grateful!