How to call the api interface in uniapp

With the development of mobile Internet, more and more companies choose to develop cross-platform applications, and UniApp has become a very popular solution. Unlike other frameworks, UniApp only needs to write one code to generate iOS, Android and other applications for multiple platforms at the same time. At the same time, UniApp’s API is relatively simple and easy to use, making it convenient for developers to carry out development work. In this article, I will mainly introduce how to use UniApp to call the API interface.

1. API Introduction

API (Application Programming Interface) refers to the application program interface, which refers to a set of predefined functions, protocols and tools. In layman's terms, an API is a set of program interfaces through which developers can interact with other programs, obtain required data or perform specified operations. The application scenarios of API are very wide, such as: third-party login, SMS verification, payment, logistics, etc.

In UniApp, we can implement corresponding functions by calling the API interface. UniApp has some commonly used APIs built in, such as routing, network requests, page layout, Storage storage, etc. In addition to the built-in API, plug-ins can also be used to extend the API to meet our more needs.

2. Network request API

In developing applications, it is often necessary to call the background interface to obtain data. UniApp has a built-in network request API to facilitate us to make interface calls. There are two main interfaces: uni.request and uni.uploadFile.

1. uni.request

uni.request The interface is mainly used to implement network requests. The request methods supported by this interface are: GET, POST, PUT, DELETE, HEAD, OPTIONS, TRACE, and CONNECT. Among them, GET and POST are the two most commonly used request methods.

uni.request has the following parameter options:

##successFunctionNoCallback function after successful requestfailFunctionNoCallback function after failed requestcompleteFunctionNoCallback function after the request is completed

Parameter name	Type	Is it required?	Function
url	String	is	request The URL address
method	String	is the	request method, supporting GET, POST, PUT, DELETE, and HEAD , OPTIONS, TRACE, CONNECT
header	Object	No	Request header information that needs to be set
data	Object/String	No	Requested data
dataType	String	No	The data type of the return value, supports json, text, default
responseType	String	No	Response type, supports text, arraybuffer, blob

The sample code is as follows:

uni.request({
  url: 'https://api.example.com/login',
  method: 'POST',
  header: {
    'content-type': 'application/json'
  },
  data: {
    username: 'example',
    password: 'example123'
  },
  success: res => {
    console.log(res.data)
  },
  fail: error => {
    console.log(error)
  }
})

2. uni.uploadFile

uni.uploadFile The interface is mainly used to upload files . This interface has the following parameter options:

Parameter nameTypeRequiredFunction##urlfilePathStringObjectObjectFunctionFunctionFunctionThe sample code is as follows:

uni.uploadFile({
  url: 'https://api.example.com/upload',
  filePath: '/path/to/file',
  name: 'file',
  header: {
    'content-type': 'multipart/form-data'
  },
  formData: {
    'name': 'example'
  },
  success: res => {
    console.log(res.data)
  },
  fail: error => {
    console.log(error)
  }
})

3. Routing API

String	is the URL address requested by
String	is the file path to be uploaded. Only local paths are supported.		name
Yes	The name of the uploaded file		header
No	Request header information that needs to be set		formData
No	Additional parameters that need to be uploaded		success
No	Callback function after successful request		fail
No	Callback function after failed request		complete
No	Callback function after the request is completed

In applications, routing is a very important concept. UniApp provides routing-related API interfaces. Here we introduce two APIs:

uni.navigateTo

and

uni.redirectTo

. uni.navigateTo

1. uni.navigateTo
interface is a method used to jump to a new page. Through this interface, we can jump to a new page and pass parameters. This interface has the following parameter options:

Parameter nameTypeurlStringFunctionFunctionFunction

Required

Function

is the page path to

, supports relative paths and absolute paths

success

No

Callback function after successful jump

fail

No

Callback function after failed jump

complete

No

Callback function after the jump is completed

示例代码如下：

uni.navigateTo({
  url: '/pages/detail/detail?id=1',
  success: res => {
    console.log(res)
  },
  fail: error => {
    console.log(error)
  }
})

2. uni.redirectTo

与 uni.navigateTo 不同，uni.redirectTo 接口是用于关闭当前页面并跳转到新页面的方法。该接口有以下参数选项：

参数名	类型	是否必填	作用
url	String	是	要跳转的页面路径，支持相对路径和绝对路径
success	Function	否	跳转成功后的回调函数
fail	Function	否	跳转失败后的回调函数
complete	Function	否	跳转完成后的回调函数

示例代码如下：

uni.redirectTo({
  url: '/pages/index/index',
  success: res => {
    console.log(res)
  },
  fail: error => {
    console.log(error)
  }
})

四、Storage API

在开发应用程序时，一些数据需要本地存储，以便在下次启动应用程序时能够快速访问到。UniApp 提供了 Storage API，用于本地存储数据。该 API 有以下方法：

方法名	参数	作用
uni.setStorage	key,value	将数据存储在本地缓存中
uni.getStorage	key	从本地缓存中获取指定 key 对应的内容
uni.removeStorage	key	从本地缓存中删除指定 key
uni.clearStorage	无	清空本地缓存

示例代码如下：

// 存储数据
uni.setStorage({
  key: 'username',
  data: 'example',
  success: function () {
    console.log('数据存储成功')
  }
})
// 获取数据
uni.getStorage({
  key: 'username',
  success: function (res) {
    console.log(res.data)
  }
})
// 删除数据
uni.removeStorage({
  key: 'username',
  success: function () {
    console.log('数据删除成功')
  }
})

五、总结

在本文中，我们主要介绍了 UniApp 的 API，其中包括网络请求、路由、Storage 存储等。了解了这些 API 后，开发者就能更加轻松地开发适用于多个平台的应用程序。当然，了解这些 API 并不是 UniApp 开发的全部。在实际的开发中，开发者还需要学习许多其它的知识，例如：组件、插件、生命周期等等。相信随着技术的不断深入，UniApp 能够成为越来越多开发者的首选开发解决方案。

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