handwriting-algorithm/19ajax.html at master · ustcfury/handwriting-algorithm · GitHub

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<!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>
    <script>
        const SERVER_URL = "/server";
        let xhr = new XMLHttpRequest();
        // 创建 Http 请求
        xhr.open("GET", SERVER_URL, true);
        // 设置状态监听函数
        xhr.onreadystatechange = function () {
            if (this.readyState !== 4) return;
            // 当请求成功时
            if (this.status === 200) {
                handle(this.response);
            } else {
                console.error(this.statusText);
            }
        };
        // 设置请求失败时的监听函数
        xhr.onerror = function () {
            console.error(this.statusText);
        };
        // 设置请求头信息
        xhr.responseType = "json";
        xhr.setRequestHeader("Accept", "application/json");
        // 发送 Http 请求
        xhr.send(null);
    </script>
</body>

</html>