diff --git a/.prettierrc b/.prettierrc
index 5787090..114615b 100644
--- a/.prettierrc
+++ b/.prettierrc
@@ -1,7 +1,7 @@
 {
   "trailingComma": "none",
   "arrowParens": "always",
-  "printWidth": 80,
+  "printWidth": 70,
   "bracketSpacing": true,
   "jsxBracketSameLine": true,
   "tabWidth": 2,
diff --git a/dist/index.js b/dist/index.js
index c941a67..e6534e2 100755
--- a/dist/index.js
+++ b/dist/index.js
@@ -67,6 +67,12 @@ else if (freeModule) {
   var EDGE_DOT_RE = /^\.|\.$/g;
   var POS1 = '.$1';
   var EMP = '';
+  var getType = function (obj) {
+    return Object.prototype.toString
+      .call(obj)
+      .slice(8, -1)
+      .toLowerCase();
+  };
   var normalize = function (path) {
     return path
       .replace(INDEXES_PATH_RE, POS1)
@@ -122,7 +128,12 @@ else if (freeModule) {
     var result;
     for (key in inObject) {
       if (hasOwn.call(inObject, key)) {
-        result = inCallback.call(inContext, key, inObject[key], inObject);
+        result = inCallback.call(
+          inContext,
+          key,
+          inObject[key],
+          inObject
+        );
         if (result === nx.BREAKER) {
           break;
         }
@@ -134,8 +145,13 @@ else if (freeModule) {
     var key, length;
     var iterator = function (inKey, inValue, inIsArray) {
       return (
-        inCallback.call(inContext, inKey, inValue, inTarget, inIsArray) ===
-        nx.BREAKER
+        inCallback.call(
+          inContext,
+          inKey,
+          inValue,
+          inTarget,
+          inIsArray
+        ) === nx.BREAKER
       );
     };
 
@@ -252,13 +268,14 @@ else if (freeModule) {
 
   nx.createOverload = function () {
     var fnCacheMap = {};
-
     function overload() {
       var args = Array.prototype.slice.call(arguments);
-      var key = args.map((item) => typeof item).join();
+      var key = args.map(getType).join();
       var fn = fnCacheMap[key];
       if (!fn) {
-        throw new Error('No matching function, parameter type: [' + key + ']');
+        throw new Error(
+          'No matching function, parameter type: [' + key + ']'
+        );
       }
       return fn.apply(this, args);
     }
diff --git a/dist/index.min.js b/dist/index.min.js
index 946a652..72cb859 100755
--- a/dist/index.min.js
+++ b/dist/index.min.js
@@ -1 +1 @@
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h})):p?((p.exports=h).nx=h,u.nx=h):t.nx=h,a=".",n="undefined",s=Array.prototype,i=Object.prototype.hasOwnProperty,e=/\[(\w+)\]/g,_=/[.]+/g,o=/^\.|\.$/g,h.noop=function(){},h.stubTrue=function(){return!0},h.stubFalse=function(){return!1},h.stubValue=function(t){return t},h.stubPromise=function(t){return Promise.resolve(t)},h.error=function(t){throw new Error(t)},h.try=function(t,e){e=e||h.noop;try{t()}catch(t){e(t)}},h.forEach=function(t,e,_){for(var s=t.length,n=0;n<s&&e.call(_,t[n],n,t)!==h.BREAKER;n++);},h.forIn=function(t,e,_){for(var s in t)if(i.call(t,s)&&e.call(_,s,t[s],t)===h.BREAKER)break},h.each=function(s,n,o){function t(t,e,_){return n.call(o,t,e,s,_)===h.BREAKER}var e,_;if(s)if("number"==typeof(_=s.length))for(e=0;e<_&&!t(e,s[e],!0);e++);else for(e in s)if(i.call(s,e)&&t(e,s[e],!1))break},h.map=function(t,e,_){var s=[];return h.each(t,function(){var t=e.apply(_,arguments);if(t===h.BREAKER)return h.BREAKER;s.push(t)}),s},h.mix=function(t){for(var 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e.initMetaProcessor(),e.createClassProcessor(),e.inheritProcessor(),e.methodsConstructorProcessor(),e.staticsConstructorProcessor(),e.registerProcessor(),e.__class__}}.call(this);
\ No newline at end of file
+!function(){var a,s,n,i,e,_,o,r,c,u,t="object"==typeof global&&global&&global.Object===Object&&global,f="object"==typeof self&&self&&self.Object===Object&&self,t=t||f||Function("return this")(),f="object"==typeof exports&&exports&&!exports.nodeType&&exports,p=f&&"object"==typeof module&&module&&!module.nodeType&&module,l=t.nx=t.nx||{BREAKER:{},NIL:{},VERSION:"1.1.11",DEBUG:!1,GLOBAL:t};function h(t){return Object.prototype.toString.call(t).slice(8,-1).toLowerCase()}function d(t){return t.replace(e,".$1").replace(_,a).replace(o,"")}function y(){}function m(t,e){this.type=t,this.meta=e,this.base=e.extends||l.RootClass,this.$base=this.base.prototype,this.__class_meta__={},this.__class__=null,this.__constructor__=null}"function"==typeof define&&"object"==typeof define.amd&&define.amd?(t.nx=l,define(function(){return l})):p?((p.exports=l).nx=l,f.nx=l):t.nx=l,a=".",s="undefined",n=Array.prototype,i=Object.prototype.hasOwnProperty,e=/\[(\w+)\]/g,_=/[.]+/g,o=/^\.|\.$/g,l.noop=function(){},l.stubTrue=function(){return!0},l.stubFalse=function(){return!1},l.stubValue=function(t){return t},l.stubPromise=function(t){return Promise.resolve(t)},l.error=function(t){throw new Error(t)},l.try=function(t,e){e=e||l.noop;try{t()}catch(t){e(t)}},l.forEach=function(t,e,_){for(var n=t.length,s=0;s<n&&e.call(_,t[s],s,t)!==l.BREAKER;s++);},l.forIn=function(t,e,_){for(var n in t)if(i.call(t,n)&&e.call(_,n,t[n],t)===l.BREAKER)break},l.each=function(n,s,o){function t(t,e,_){return s.call(o,t,e,n,_)===l.BREAKER}var e,_;if(n)if("number"==typeof(_=n.length))for(e=0;e<_&&!t(e,n[e],!0);e++);else for(e in n)if(i.call(n,e)&&t(e,n[e],!1))break},l.map=function(t,e,_){var n=[];return l.each(t,function(){var t=e.apply(_,arguments);if(t===l.BREAKER)return l.BREAKER;n.push(t)}),n},l.mix=function(t){for(var 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diff --git a/src/core.js b/src/core.js
index 63521a5..3aabd97 100755
--- a/src/core.js
+++ b/src/core.js
@@ -9,6 +9,12 @@
   var EDGE_DOT_RE = /^\.|\.$/g;
   var POS1 = '.$1';
   var EMP = '';
+  var getType = function (obj) {
+    return Object.prototype.toString
+      .call(obj)
+      .slice(8, -1)
+      .toLowerCase();
+  };
   var normalize = function (path) {
     return path
       .replace(INDEXES_PATH_RE, POS1)
@@ -64,7 +70,12 @@
     var result;
     for (key in inObject) {
       if (hasOwn.call(inObject, key)) {
-        result = inCallback.call(inContext, key, inObject[key], inObject);
+        result = inCallback.call(
+          inContext,
+          key,
+          inObject[key],
+          inObject
+        );
         if (result === nx.BREAKER) {
           break;
         }
@@ -76,8 +87,13 @@
     var key, length;
     var iterator = function (inKey, inValue, inIsArray) {
       return (
-        inCallback.call(inContext, inKey, inValue, inTarget, inIsArray) ===
-        nx.BREAKER
+        inCallback.call(
+          inContext,
+          inKey,
+          inValue,
+          inTarget,
+          inIsArray
+        ) === nx.BREAKER
       );
     };
 
@@ -194,13 +210,14 @@
 
   nx.createOverload = function () {
     var fnCacheMap = {};
-
     function overload() {
       var args = Array.prototype.slice.call(arguments);
-      var key = args.map((item) => typeof item).join();
+      var key = args.map(getType).join();
       var fn = fnCacheMap[key];
       if (!fn) {
-        throw new Error('No matching function, parameter type: [' + key + ']');
+        throw new Error(
+          'No matching function, parameter type: [' + key + ']'
+        );
       }
       return fn.apply(this, args);
     }