feat: add export to .md button

app/utils.ts

@@ -9,3 +9,24 @@ export function trimTopic(topic: string) {
 
   return s.join("");
 }
+
+export function copyToClipboard(text: string) {
+  navigator.clipboard.writeText(text).then(res => {
+    alert('复制成功')
+  }).catch(err => {
+    alert('复制失败，请赋予剪切板权限')
+  })
+}
+
+export function downloadAs(text: string, filename: string) {
+  const element = document.createElement('a');
+  element.setAttribute('href', 'data:text/plain;charset=utf-8,' + encodeURIComponent(text));
+  element.setAttribute('download', filename);
+
+  element.style.display = 'none';
+  document.body.appendChild(element);
+
+  element.click();
+
+  document.body.removeChild(element);
+}