新建api文件，新建api.js 写一下代码

  export const API_HOST = "接口前缀";
  const app = getApp();
  const ReqClient = (url, method, data) => {
    return new Promise((resolve, reject) => {
      wx.request({
        url: API_HOST + url,
        data,
        method,
        header: {
          'content-type': 'application/x-www-form-urlencoded'
        },
        success: (res) => resolve(res),
        fail: err => reject(err)
      })
    })
  }

  export const 接口名字= data => {
    return ReqClient('接口', 'POST', {
      ...data
    })
  }

  export const 接口名字= data => {
    return ReqClient('接口', 'GET', {
      ...data
    })
  }

调用接口

// 先引入 然后调取即可
import {
  wxLogin
} from '封装api的路径'
wxLogin(数据).then(res => {
  if (res.data.code == 0) {
    //成功获取
  } else {
    wx.showToast({
      title: res.data.msg,
      icon: 'none'
    })
  }
})