Merge pull request cocos2d#3508 from zx6733090/develop

fix the problem of loading local resources failed

Author: pandamicro

CCBoot.js

@@ -797,7 +797,7 @@ cc.loader = (function () {
                     xhr.setRequestHeader("Accept-Charset", "utf-8");
                     xhr.onreadystatechange = function () {
                         if (xhr.readyState === 4)
-                            xhr.status === 200 ? cb(null, xhr.responseText) : cb({status:xhr.status, errorMessage:errInfo}, null);
+                            (xhr.status === 200||xhr.status === 0) ? cb(null, xhr.responseText) : cb({status:xhr.status, errorMessage:errInfo}, null);
                     };
                 } else {
                     if (xhr.overrideMimeType) xhr.overrideMimeType("text\/plain; charset=utf-8");
@@ -811,7 +811,7 @@ cc.loader = (function () {
                             xhr.removeEventListener('timeout', timeoutCallback);
                         }
                         if (xhr.readyState === 4) {
-                            xhr.status === 200 ? cb(null, xhr.responseText) : cb({status:xhr.status, errorMessage:errInfo}, null);
+                            (xhr.status === 200||xhr.status === 0) ? cb(null, xhr.responseText) : cb({status:xhr.status, errorMessage:errInfo}, null);
                         }
                     };
                     var errorCallback = function () {
@@ -876,7 +876,7 @@ cc.loader = (function () {
                     window.msg = arrayBuffer;
                 }
                 if (xhr.readyState === 4) {
-                    xhr.status === 200 ? cb(null, xhr.response) : cb({status:xhr.status, errorMessage:errInfo}, null);
+                    (xhr.status === 200||xhr.status === 0) ? cb(null, xhr.response) : cb({status:xhr.status, errorMessage:errInfo}, null);
                 }
             };
             var errorCallback = function(){