chore(cli): extract copyToClipboard to common (#10263)

* chore(cli): extract copyToClipboard to common

* style: update copied

packages/vant-cli/site/common/index.js

@@ -8,4 +8,31 @@ export function decamelize(str, sep = '-') {
     .toLowerCase();
 }
 
+// from https://30secondsofcode.org
+export function copyToClipboard(str) {
+  const el = document.createElement('textarea');
+  el.value = str;
+  el.setAttribute('readonly', '');
+  el.style.position = 'absolute';
+  el.style.left = '-9999px';
+  document.body.appendChild(el);
+
+  const selection = document.getSelection();
+
+  if (!selection) {
+    return;
+  }
+
+  const selected = selection.rangeCount > 0 ? selection.getRangeAt(0) : false;
+
+  el.select();
+  document.execCommand('copy');
+  document.body.removeChild(el);
+
+  if (selected) {
+    selection.removeAllRanges();
+    selection.addRange(selected);
+  }
+}
+
 export { isMobile };