Encapsulate network requests and mock data

Video address: v.qq.com/x/page/i055…

Before starting, please import the code/ directory in ch2-3 branch into wechat development tool

In the previous section, we added the util object to the index.js file and encapsulated many common methods in the object

letUtil = {the log () {... {}, alert ()... {}, getStorageData ()... {}, setStorageData ()... }}Copy the code

In this section, we encapsulate the commonly used network request method wx.request

  let util = {
    // Omit some code here
    request(opt){
      let {url, data, header, method, dataType} = opt
      let self = this
      return new Promise((resolve, reject) = >{
        wx.request({
          url: url,
          data: data,
          header: header,
          method: method,
          dataType: dataType,
          success: function (res) {
            if (res && res.statusCode == 200 && res.data) {
              resolve(res.data);
            } else {
              self.alert('tip', res); reject(res); }},fail: function (err) {
            self.log(err);
            self.alert('tip', err); reject(err); }})})}}Copy the code

For the request parameters, we set the default values, easy to call

  const DEFAULT_REQUEST_OPTIONS = {
    url: ' '.data: {},
    header: {
      "Content-Type": "application/json"
    },
    method: 'GET'.dataType: 'json'
  }

  let util = {
    // Omit some code here
    request (opt){
      let options = Object.assign({}, DEFAULT_REQUEST_OPTIONS, opt)
      let {url, data, header, method, dataType, mock = false} = options
      let self = this
      // Omit some code here}}Copy the code

For local development debugging, we need to add our mock data and modify util.request

  let util = {
    // Omit some code here
    request (opt){
      let options = Object.assign({}, DEFAULT_REQUEST_OPTIONS, opt)
      let {url, data, header, method, dataType, mock = false} = options
      let self = this
      return new Promise((resolve, reject) = >{
        if(mock){
          let res = {
            statusCode: 200.data: Mock[url]
          }
          if (res && res.statusCode == 200 && res.data) {
            resolve(res.data);
          } else {
            self.alert('tip', res); reject(res); }}else{
          wx.request({
            url: url,
            data: data,
            header: header,
            method: method,
            dataType: dataType,
            success: function (res) {
              if (res && res.statusCode == 200 && res.data) {
                resolve(res.data);
              } else {
                self.alert('tip', res); reject(res); }},fail: function (err) {
              self.log(err);
              self.alert('tip', err); reject(err); }})}})}Copy the code

Mock = true: mock = true: mock = true: Mock = true: Mock = true: Mock = true: Mock = true: Mock = true

The call method is as follows:

  util.request({
    url: 'list'.mock: true.data: {
      tag:'Wechat Hot'.start: 1.days: 3.pageSize: 5.langs: 'en'
    }
  }).then(res= > {
    // do something
  })
Copy the code

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