0%

722_ajax_json格式

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      #box {
        width: 200px;
        height: 100px;
        border: solid 1px pink;
      }
    </style>
  </head>
  <body>
    <div id="box"></div>
    <script>
      const box = document.querySelector("#box");
      window.onkeydown = function () {
        //1、创建对象
        const xhr = new XMLHttpRequest();
        //设置响应体数据类型
        xhr.responseType = "json";
        //2、初始化
        xhr.open("GET", "http://127.0.0.1:8000/json-server");
        //3、发送
        xhr.send();
        //4、事件绑定,处理服务端返回的结果
        xhr.onreadystatechange = function () {
          //判断(服务端返回了所有结果)
          if (xhr.readyState === 4) {
            //判断响应状态码 2##表示成功
            if (xhr.status >= 200 && xhr.status < 300) {
              box.innerHTML = xhr.response.name;
            } else {
            }
          }
        };
      };
    </script>
  </body>
</html>