fix(withdrawal): validate decimal amount input

h5/hyapp/withdraw-exchange/script.js

@@ -2,6 +2,7 @@
   const API_BASE_URL = "https://jvapi.haiyihy.com";
   const EXCHANGE_RATE = 80000;
   const WITHDRAW_MIN_AMOUNT = 50;
+  const AMOUNT_FRACTION_DIGITS = 2;
   const supportedLanguages = ["en", "ar", "tr", "id"];
   const languageLabels = {
     en: "EN",
@@ -483,7 +484,32 @@
 
   function formatMoneyInput(value) {
     const number = Number(value);
-    return Number.isFinite(number) ? number.toFixed(2) : "0.00";
+    return Number.isFinite(number) ? number.toFixed(AMOUNT_FRACTION_DIGITS) : "0.00";
+  }
+
+  function normalizeAmountValue(value) {
+    const raw = String(value || "").trim();
+    if (!raw) return "";
+    // 金额只接受普通十进制正数；不能把 -50 或 1e2 静默清洗成另一笔正数，避免用户看到值与实际提交值不一致。
+    if (/[eE+-]/.test(raw)) return "";
+
+    const sanitized = raw.replace(/[^\d.]/g, "");
+    const dotIndex = sanitized.indexOf(".");
+    if (dotIndex < 0) return sanitized;
+
+    const integerPart = sanitized.slice(0, dotIndex) || "0";
+    const fractionPart = sanitized.slice(dotIndex + 1)
+      .replace(/\./g, "")
+      .slice(0, AMOUNT_FRACTION_DIGITS);
+    return `${integerPart}.${fractionPart}`;
+  }
+
+  function parseAmountValue(value) {
+    const raw = String(value || "").trim();
+    // input 事件之外仍需校验原始文本，防止脚本赋值或浏览器差异绕过两位小数限制后被后端拒绝。
+    if (!/^\d+(?:\.\d{0,2})?$/.test(raw)) return Number.NaN;
+    const amount = Number(raw);
+    return Number.isFinite(amount) ? amount : Number.NaN;
   }
 
   function moneyNumber(value) {
@@ -502,7 +528,7 @@
   }
 
   function activeAmount() {
-    return moneyNumber(activeInput()?.value);
+    return parseAmountValue(activeInput()?.value);
   }
 
   function formatExchangeRate() {
@@ -613,12 +639,12 @@
     submitButton.textContent = submitLabels[currentMode];
 
     const amount = activeAmount();
+    const invalidAmount = !Number.isFinite(amount) || amount <= 0;
     const exceedsBalance = amount > availableBalance;
     const missingWithdrawInfo = currentMode === "withdraw" && !selectedPaymentInfo?.id;
     const missingPayee = currentMode === "transfer" && !selectedPayee?.id;
 
-    submitButton.disabled = !amount ||
+    submitButton.disabled = invalidAmount ||
-      amount <= 0 ||
       exceedsBalance ||
       missingWithdrawInfo ||
       missingPayee ||
@@ -1167,10 +1193,8 @@
   function normalizeAmountInput(event) {
     const input = event?.target || activeInput();
     if (!input) return;
-    const raw = String(input.value || "").replace(/[^\d.]/g, "");
+    let nextValue = normalizeAmountValue(input.value);
-    const parts = raw.split(".");
+    const amount = parseAmountValue(nextValue);
-    let nextValue = parts.length > 2 ? `${parts[0]}.${parts.slice(1).join("")}` : raw;
-    const amount = Number(nextValue);
     if (Number.isFinite(amount) && amount > availableBalance) nextValue = formatMoneyInput(availableBalance);
     input.value = nextValue;
     updateSubmitState();
@@ -1178,7 +1202,7 @@
 
   function validateAmount(requireMinimum) {
     const amount = activeAmount();
-    if (!amount || amount <= 0) return "invalid_amount";
+    if (!Number.isFinite(amount) || amount <= 0) return "invalid_amount";
     if (requireMinimum && amount < WITHDRAW_MIN_AMOUNT) return "amount_too_low";
     if (amount > availableBalance) return "amount_exceeds_balance";
     return "";