export、import

// 1、默认导出变量
  const test = 'hellow world'
  export default test

  import testStr from './test.js'
  console.log(testStr) // hellow world

  // 2、默认导出函数
  const request = (params) => {
    return {
      name: 'zhangsan',
      age: 10
    }
  }
  export default request;

  import requestFn from './test.js'
  console.log(requestFn()) // {name: 'zhangsan', age: 10}

  // 3、默认导出对象
  const page = 10;
  const currrent = 0;
  export default {
    page,
    currrent
  }
  
  import pageObj from './test.js'
  console.log(pageObj) // {page: 10, currrent: 0}

  // 1、多个导出
  export function test1() {
    console.log('tst1')
  }

  export function test2() {
    console.log('tst2')
  }

  import { test1, test2 } from './test.js'

  // 2、多个导出合并写法
  function test1() {
    console.log('tst1')
  }

  function test2() {
    console.log('tst1')
  }

  export {
    test1,
    test2
  }

  import { test1, test2 } from './test.js'

  // 3、再导出
  function test1() {
    console.log('tst1')
  }

  function test2() {
    console.log('tst1')
  }

  export {
    test1,
    test2
  }

  // 导入区块代码
  export { test1, test2 } from './test.js'
  // 上面代码等同于
  import { test1, test2 } from './test.js'
  export { test1, test2 }

  // 4、导出所有
  export function test1() {
    console.log('test1')
  }

  export function test2() {
    console.log('test2')
  }

  // 中间文件index.js
  export * from './test.js'
  export * from './test2.js'

  import { test1, test2 } from './index.js'
  console.log(test1()) // test1