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JavaScript 跨域请求:fetch、async
尹辉
Original
308 people have browsed it

实例演示fetch , async, await 的用法

服务器端

test1.php

  1. <?php
  2. // 允许跨域
  3. header('Access-Control-Allow-Origin: *');
  4. // 输出 JSON 字符串
  5. echo json_encode(['uname'=> '马老师', 'email'=> '5678@qq.com' ]);

1, fetch

  1. <body>
  2. <button onclick="getData()">fetch 跨域请求</button>
  3. <script>
  4. function getData() {
  5. // 1. fetch(url): 向一个url发请异步请求
  6. fetch(`http://world.io/test1.php`)
  7. // 2. then(response=>response.json()), 将返回结果转换为 JSON 字符串
  8. .then(res => res.json())
  9. // 3. then(json=>console.log(json)),接下来就可以处理第2步的 JSON 字符串了
  10. .then(json => {
  11. document.body.insertAdjacentHTML('beforeend', `<p>${json.uname}</p>`)
  12. })
  13. }
  14. </script>
  15. </body>

点击按钮,页面输出请求的数据:

2, async、await

  1. <body>
  2. <button onclick="getData(this)">async 跨域请求</button>
  3. <script>
  4. // 异步函数,前面加 async
  5. async function getData(ele) {
  6. const url = 'http://world.io/test1.php'
  7. try {
  8. // 1. 发起异步请求,等待返回结果的响应对象
  9. const response = await fetch(url)
  10. // 2. 如果响应成功,将响应结果转为json
  11. const result = await response.json()
  12. // 3. 对响应结果进行处理,例如渲染到到页面,或打印到控制台查看
  13. ele.insertAdjacentHTML('afterend', `<p>${result.email}</p>`)
  14. } catch {
  15. console.error('请求失败')
  16. }
  17. }
  18. </script>
  19. </body>

点击按钮,页面输出请求的数据:

Correcting teacher:PHPzPHPz

Correction status:qualified

Teacher's comments:
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