<div class="container">
  <h2 class="page-header">axios 基本用法</h2>
  <button class="btn btn-primary">发送 GET 请求</button>
  <button class="btn btn-warning" style="color: white;">发送 POST 请求</button>
  <button class="btn btn-success">发送 PUT 请求</button>
  <button class="btn btn-danger">发送 DELETE 请求</button>
</div>
<script>
  const btns = document.querySelectorAll('button');

  axios.defaults.baseURL = 'http://localhost:3000';       // 默认 URL 公共部分
  axios.defaults.headers = {'abc': '123'},    // 默认请求头

    btns[0].onclick = () => {
    axios.get('/posts').then(res => {
      console.log(res);
    })
  }
</script>