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code/email/Email-Vue/src/utils/common.ts

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+import { Message } from "@arco-design/web-vue";
+
+/**
+ * 复制文本到剪切板
+ * @param text 复制内容
+ * @returns 是否复制成功
+ */
+export function copyText(text: string) {
+  if (navigator.clipboard && window.isSecureContext) {
+    // 现代浏览器和安全环境下，直接用 Clipboard API
+    return navigator.clipboard
+      .writeText(text)
+      .then(() => {
+        Message.success("复制成功");
+      })
+      .catch((err) => {
+        Message.error("复制失败：" + err);
+      });
+  } else {
+    // 退回到传统方式
+    fallbackCopyText(text);
+  }
+}
+
+/**
+ * 复制文本到剪切板的传统方式
+ * @param text 复制内容
+ */
+function fallbackCopyText(text: string) {
+  const textArea = document.createElement("textarea");
+  textArea.value = text;
+
+  // 避免滚动到页面底部
+  textArea.style.position = "fixed";
+  textArea.style.top = "0";
+  textArea.style.left = "0";
+
+  document.body.appendChild(textArea);
+  textArea.focus();
+  textArea.select();
+
+  try {
+    const successful = document.execCommand("copy");
+    if (successful) {
+      console.log("复制成功（fallback）");
+    } else {
+      console.log("复制失败（fallback）");
+    }
+  } catch (err) {
+    console.error("复制失败（fallback）", err);
+  }
+
+  document.body.removeChild(textArea);
+}
+export function formatFileSizeToString(size: number): string {
+  if (size < 0) return "0 B";
+
+  const units = ["B", "KB", "MB", "GB", "TB"];
+  let sizeD = size;
+  let unitIndex = 0;
+
+  while (sizeD >= 1024 && unitIndex < units.length - 1) {
+    sizeD /= 1024;
+    unitIndex++;
+  }
+
+  let formatted: string;
+  if (sizeD < 10) {
+    formatted = sizeD.toFixed(2);
+  } else if (sizeD < 100) {
+    formatted = sizeD.toFixed(1);
+  } else {
+    formatted = sizeD.toFixed(0);
+  }
+
+  return `${formatted} ${units[unitIndex]}`;
+}