diff --git a/tools/bytejs.js b/tools/bytejs.js
index d667436..dfa03ae 100644
--- a/tools/bytejs.js
+++ b/tools/bytejs.js
@@ -1,26 +1,34 @@
 // makebytejs.js
-const vm = require('vm');
-const fs = require('fs').promises;
-const _module = require('module');
-const v8 = require('v8');
+var vm = require('vm');
+var fs = require('fs');
+var _module = require('module');
+var v8 = require('v8');
 v8.setFlagsFromString('--no-lazy');
 
-async function compileFile(filePath) {
-  const code = await fs.readFile(filePath, 'utf-8');
-  const script = new vm.Script(_module.wrap(code));
-  const bytecode = script.createCachedData();
-  await fs.writeFile(filePath.replace(/\.js$/i, '.bytecode'), bytecode);
+function xor(buffer){
+  var key = '123456789'.split('').map(function(e){return e.charCodeAt()})
+  for (var i = 0; i < buffer.length; i++) {
+    buffer[i] ^= key[i % key.length]
+  }
 }
-compileFile('./test.js');
 
+function compileFile(filePath) {
+  if (!fs.existsSync(filePath)) return
+  var code = fs.readFileSync(filePath, 'utf-8');
+  var script = new vm.Script(_module.wrap(code));
+  var bytecode = script.createCachedData();
+  xor(bytecode)
+  fs.writeFileSync('main.bytecode', bytecode);
+}
+compileFile('./main_.js');
 
 
 // runbytejs.js
-const _module = require('module');
-const path = require('path');
-const fs = require('fs')
-const vm = require('vm');
-const v8 = require('v8');
+var _module = require('module');
+var path = require('path');
+var fs = require('fs')
+var vm = require('vm');
+var v8 = require('v8');
 v8.setFlagsFromString('--no-flush-bytecode');
 function validateString(value, name) {
   if (typeof value !== 'string') {
@@ -28,8 +36,8 @@ function validateString(value, name) {
   }
 }
 function makeRequireFunction(mod) {
-  const Module = mod.constructor;
-    const require = function require(path) {
+  var Module = mod.constructor;
+    var require = function require(path) {
     return mod.require(path);
   };
     require.resolve = function resolve(request, options) {
@@ -45,22 +53,18 @@ function makeRequireFunction(mod) {
   require.cache = Module._cache;
     return require;
 }
-const HeaderOffsetMap = {
+var HeaderOffsetMap = {
   'magic': 0,
   'version_hash': 4,
   'source_hash': 8,
   'flag_hash': 12
 };
-let _flag_buf;
 function getFlagBuf() {
-  if (!_flag_buf) {
-    const script = new vm.Script("");
-    _flag_buf = getHeader(script.createCachedData(), 'flag_hash');
-  }
-  return _flag_buf;
+  var script = new vm.Script("");
+  return getHeader(script.createCachedData(), 'flag_hash');
 }
 function getHeader(buffer, type) {
-  const offset = HeaderOffsetMap[type];
+  var offset = HeaderOffsetMap[type];
   return buffer.slice(offset, offset + 4);
 }
 function setHeader(buffer, type, vBuffer) {
@@ -68,7 +72,7 @@ function setHeader(buffer, type, vBuffer) {
 }
 function buf2num(buf) {
   // 注意字节序问题
-  let ret = 0;
+  var ret = 0;
   ret |= buf[3] << 24;
   ret |= buf[2] << 16;
   ret |= buf[1] << 8;
@@ -76,11 +80,11 @@ function buf2num(buf) {
     return ret;
 }
 function loadBytecode(filePath) {
-  const bytecode = fs.readFileSync(filePath, null);
-  console.log(bytecode.toString('latin1'))
+  var bytecode = fs.readFileSync(filePath, null);
+  xor(bytecode)
   setHeader(bytecode, 'flag_hash', getFlagBuf());
-  const sourceHash = buf2num(getHeader(bytecode, 'source_hash'));
-  const script = new vm.Script(' '.repeat(sourceHash), {
+  var sourceHash = buf2num(getHeader(bytecode, 'source_hash'));
+  var script = new vm.Script(' '.repeat(sourceHash), {
     filename: filePath,
     cachedData: bytecode,
     lineOffset: 0,
@@ -92,17 +96,15 @@ function loadBytecode(filePath) {
   return script;
 }
 _module._extensions['.bytecode'] = function (module, filename) {
-  const script = loadBytecode(filename, false);
-  const wrapperFn = script.runInThisContext({
+  var script = loadBytecode(filename, false);
+  var wrapperFn = script.runInThisContext({
     filename: filename,
     displayErrors: true,
     lineOffset: 0,
     columnOffset: 0,
   });
-  const require = makeRequireFunction(module);
+  var require = makeRequireFunction(module);
   wrapperFn.bind(module.exports)(module.exports, require, module, filename, path.dirname(filename));
 }
 
-require('./test.bytecode')
-
-console.log(window.top == window.self)
\ No newline at end of file
+require('./main.bytecode')
\ No newline at end of file