fix

Author: sparrow-js

components/compiler/index.ts

@@ -211,6 +211,7 @@ export default function setCodeUid (code: string, path: string = '/mock.tsx') {
 
 export function setHtmlCodeUid(code: string, path: string = '/mock.tsx') {
   var patternBody = /<body[^>]*>((.|[\n\r])*)<\/body>/im; //匹配header
+  if (!code) return code;
   const headMatch = code.match(patternBody);
   if (headMatch) {
     const htmlCode = `

engine/index.tsx

@@ -63,12 +63,12 @@ export default function PreviewBox({ code, appState, sendMessageChange, history
 
     useEffect(() => {
         if (appState === AppState.CODE_READY) {
-            const codeUid = setHtmlCodeUid(throttledCode);
+            const codeUid = setHtmlCodeUid(code);
             designer.project.simulator?.writeIframeDocument(codeUid);
         } else {
             // designer.project.simulator?.writeIframeDocument(throttledCode);
         }
-    }, [throttledCode]);
+    }, [code, appState]);
 
     const takeScreenshot = async (): Promise<string> => {
         const body = designer.project.simulator?.contentWindow?.document.body;