Web API

  <div id="fetch-api"></div>
  <script>
  const URL = 'https://jsonplaceholder.typicode.com/todos/5';
  fetch(URL)
    .then(res => res.json())
    .then(data => {
    document.getElementById("fetch-api").innerHTML += 
    "从 API 获取的 data: " + "<br>" + 
    JSON.stringify(data);
    });
  </script>