Map<String, String> requestParam = new HashMap<>(); requestParam.put("app_key", "100001"); requestParam.put("timestamp", "2018-01-22 10:10:10"); requestParam.put("format", "json"); requestParam.put("v", "1"); requestParam.put("sign_method", "MD5"); requestParam.put("session", "ee45021744e2d32eab172a5b7b04ae793bc6e97d"); requestParam.put("qr_code", "4yZB6nPiS4SXXkLKIpFLVg%3D%3D@993830"); //验证签名，详情见签名生成说明文档 requestParam.put("sign", SignUtil.signTopRequest(requestParam, "1590f337484080dfa05e949f6b2c3c0357948876", "MD5")) //构造form Form form = Form.form(); for (Map.Entry<String, String> entry : requestParam.entrySet()) { form.add(entry.getKey(), entry.getValue()); } //发起post请求 return Request.Post("https://openapi.dianping.com/router/tuangou/receipt/scanprepare") .bodyForm(form.build()) .setHeader("Content-Type", ContentType.create("application/x-www-form-urlencoded", "UTF-8").toString()) .execute().returnContent().asString(); 帮我用js重新写一下上面的代码

以下是使用 JavaScript 重新编写的代码，实现与您提供的 Java 代码类似的功能： ```javascript const requestParam = new Map(); requestParam.set("app_key", "100001"); requestParam.set("timestamp", "2018-01-22 10:10:10"); requestParam.set("format", "json"); requestParam.set("v", "1"); requestParam.set("sign_method", "MD5"); requestParam.set("session", "ee45021744e2d32eab172a5b7b04ae793bc6e97d"); requestParam.set("qr_code", "4yZB6nPiS4SXXkLKIpFLVg%3D%3D@993830"); // 构造签名 const appSecret = "1590f337484080dfa05e949f6b2c3c0357948876"; const sign = generateSignature(requestParam, appSecret, "MD5"); requestParam.set("sign", sign); // 构造请求参数 let formData = ""; for (const [key, value] of requestParam.entries()) { formData += encodeURIComponent(key) + "=" + encodeURIComponent(value) + "&"; } formData = formData.slice(0, -1); // 发起 POST 请求 fetch("https://openapi.dianping.com/router/tuangou/receipt/scanprepare", { method: "POST", headers: { "Content-Type": "application/x-www-form-urlencoded;charset=UTF-8", }, body: formData, }) .then((response) => response.text()) .then((data) => console.log(data)) .catch((error) => console.log(error)); function generateSignature(params, appSecret, signMethod) { // 对参数名进行排序 const sortedKeys = Array.from(params.keys()).sort(); // 拼接参数名和参数值 let paramString = ""; sortedKeys.forEach((key) => { if (key !== "sign" && params.get(key) !== "") { paramString += key + params.get(key); } }); // 添加 appSecret paramString += appSecret; // 使用指定的签名方法对参数进行摘要 if (signMethod === "MD5") { return md5(paramString); } else { throw new Error("Unsupported sign method"); } } function md5(str) { const md5 = require("crypto-js/md5"); return md5(str).toString(); } ``` 请注意，上述代码中使用了 `fetch` 函数来发起 POST 请求。如果您在非浏览器环境下使用，可以使用其他适合的方式来发起请求，例如 `axios`、`node-fetch` 等。此外，`crypto-js` 库用于计算 MD5 摘要，请确保已经安装了该库。