Update index.js

index.js

@@ -1133,6 +1133,7 @@ function copy_s_to_proto() {
 function copy_proto_to_c() {
 	outDir = path.sharedPath;
 	try {
+		fse.emptyDirSync(outDir);
 		fse.copySync('./s_to_proto/shared/', outDir);
 		console.log('目录拷贝完成');
 	} catch (err) {