Methods to implement synchronous requests in WeChat applet

The content of this article is about the method of implementing synchronous requests in WeChat applet. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

The WeChat applet uses synchronous requests by default, but sometimes synchronous requests for data are required. There are many methods that can be used, and there are two commonly used ones

1. globalData Global variables

app.js

App({
  // 全局变量
  globalData: {
    currentPage: 1,
    allData: null,
    findData: null,
  },
})

index.js

// 获取应用实例
const app = getApp();
// 使用全局变量
data = app.globalData.currentPage;

2. Reference third-party library es6-promise

var Promise = require('../plugins/es6-promise.js')

function wxPromisify(fn) {
  return function (obj = {}) {
    return new Promise((resolve, reject) => {
      obj.success = function (res) {
        //成功
        resolve(res)
      }
      obj.fail = function (res) {
        //失败
        reject(res)
      }
      fn(obj)
    })
  }
}
//无论promise对象最后状态如何都会执行
Promise.prototype.finally = function (callback) {
  let P = this.constructor;
  return this.then(
    value => P.resolve(callback()).then(() => value),
    reason => P.resolve(callback()).then(() => { throw reason })
  );
};
/**
 * 微信请求get方法
 * url
 * data 以对象的格式传入
 */
function getRequest(url, data) {
  var getRequest = wxPromisify(wx.request)
  return getRequest({
    url: url,
    method: 'GET',
    data: data,
    header: {
      'Content-Type': 'application/json'
    }
  })
}

/**
 * 微信请求post方法封装
 * url
 * data 以对象的格式传入
 */
function postRequest(url, data) {
  var postRequest = wxPromisify(wx.request)
  return postRequest({
    url: url,
    method: 'POST',
    data: data,
    header: {
      "content-type": "application/x-www-form-urlencoded"
    },
  })
}

module.exports = {
  postRequest: postRequest,
  getRequest: getRequest
}

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