老师请帮忙检查

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <button id="btn">点击发送POST请求</button>

    <script>
      const Btn = document.getElementById("btn");

      Btn.addEventListener(
        "click",
        () => {
          const url =
            "https://www.imooc.com/api/http/json/search/suggest?words=js";

          const xhr = new XMLHttpRequest();

          xhr.addEventListener(
            "load",
            () => {
              if (
                (xhr.status >= 200 && xhr.status < 300) ||
                xhr.status === 304
              ) {
                console.log("response:", xhr.response);
              }
            },
            false
          );

          xhr.open("POST", url, true);
          xhr.send(JSON.stringify({ username: "imooc" }));
        },
        false
      );
    </script>
  </body>
</html>

清夏_ 2022-10-08

源自：Ajax&Fetch 与跨域请求 5-6 自由编程