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723_ajax_jsonp

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <!-- 只适用于get请求 -->
    用户名:<input type="text" id="username" />
    <p></p>
    <script>
      //获取input元素
      const input = document.querySelector("#username");
      const p = document.querySelector("p");

      //声明handle函数
      function handle(data) {
        input.style.border = "solid 1px red";
        p.innerHTML = data.msg;
      }

      //绑定事件
      input.onblur = function () {
        //获取用户输入值
        let username = this.value;
        //向服务端发送请求,检测用户名是否已经存在
        //1、创建script标签
        const script = document.createElement("script");
        //2、设置标签的src属性
        script.src = "http://127.0.0.1:8000/check-username";
        //添加script
        document.body.appendChild(script);
      };
    </script>
  </body>
</html>