fix

src/components/Preview.vue

@@ -13,20 +13,19 @@ function preview() {
   const doc = iframe.value.contentDocument!
   doc.open()
   doc.write(`<!DOCTYPE html>
-  <html lang="zh-Hans-CN">
-    <head>
-      <meta charset="UTF-8" />
-      <title>预览</title>
-      <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-      <style>${css.value}</style>
-    </head>
-    <body>
-      ${html.value}
-    </body>
-  </html>`)
+<html lang="zh-Hans-CN">
+  <head>
+    <meta charset="UTF-8" />
+    <title>预览</title>
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <style>${css.value}</style>
+  </head>
+  <body>
+    ${html.value}
+  </body>
+</html>`)
   doc.close()
 }
-
 watch([html, css], preview)
 onMounted(preview)
 </script>