uniapp local request

With the rapid development of mobile Internet, mobile applications have become one of people's most important tools. Many developers choose to develop native applications in pursuit of program stability and user experience. However, native application development involves a variety of technologies and has higher development costs. In order to reduce development costs, many developers have begun to use uniapp to develop cross-platform applications.

uniapp is a cross-platform application development framework based on Vue.js, which supports one-time writing and multi-end publishing, including H5, mini programs, and APPs. Developers use vue syntax for development, and can use a set of codes to generate applications for multiple platforms such as iOS, Android and Web at the same time. It can achieve the smallest amount of code, the fastest speed, and provide a consistent experience for multiple platforms. Today we want to focus on uniapp’s local requests.

In uniapp, we often need to send requests to local databases or local files. This mainly involves HTTP requests and file system operations. Before that, we need to understand the relevant API provided by uniapp.

1. uni.request

uni.request is a basic API of uniapp, used to send requests to the server. The following is an example of using uni.request:

uni.request({
  url: 'https://www.example.com/api/login',
  method: 'POST',
  data: {
    username: 'username',
    password: 'password'
  },
  success: function (res) {
    console.log(res.data)
  }
})

As can be seen from the above example, we need to provide the requested URL, request method, request parameters and callback function. uni.request will automatically encapsulate the request result into an object, which contains a lot of information, such as request status code, request header, request body, etc.

2. uni.getStorageSync and uni.setStorageSync

uni.getStorageSync and uni.setStorageSync are APIs provided by uniapp for reading and writing local caches. They can be used to easily store some important data in the local cache and call it when needed.

The following is an example of using uni.setStorageSync to save data in a local cache:

uni.setStorageSync('userInfo', {
  username: 'username',
  password: 'password'
})

When needed, we can use uni.getStorageSync to obtain the data saved locally:

let userInfo = uni.getStorageSync('userInfo')

3. uni.saveFile and uni.getSavedFileList

uni.saveFile and uni.getSavedFileList are APIs provided by uniapp for file operations. Use them to easily save and read local files. The following is an example of using uni.saveFile to save pictures locally:

uni.downloadFile({
  url: 'https://www.example.com/images/picture.jpg',
  success: function (res) {
    uni.saveFile({
      tempFilePath: res.tempFilePath,
      success: function (res) {
        console.log('save file success: ', res.savedFilePath)
      }
    })
  }
})

When needed, you can use uni.getSavedFileList to get the list of files saved locally:

uni.getSavedFileList({
  success: function (res) {
    console.log('file list:', res.fileList)
  }
})

In use When using these APIs, you need to pay attention to some details. For example, when we want to upload a local file, we need to pay attention to the file size limit and file format limit. In addition, in order to ensure the security of the program, the input parameters need to be strictly checked to prevent security issues such as injection attacks.

To summarize, uniapp provides a rich set of local request APIs, including network request API (uni.request), local cache API (uni.getStorageSync and uni.setStorageSync) and file operation API (uni.saveFile and uni .getSavedFileList). Using these APIs can easily implement local operations of the program and improve the performance and user experience of the program. In actual development, we need to choose the appropriate API according to specific needs and pay attention to details to ensure the stability and security of the program.

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