diff --git a/index.js b/index.js
index 1bd7d1e..55cad05 100644
--- a/index.js
+++ b/index.js
@@ -21,10 +21,7 @@ class Stats {
   }
 }
 
-const VERSION = +process.versions.node
-  .split('.')
-  .slice(0, 2)
-  .join('.')
+const VERSION = +process.versions.node.split('.').slice(0, 2).join('.')
 
 const EMPTY_STAT = new Stats()
 
@@ -288,7 +285,7 @@ const Iofs = {
    * @param  {String} file [目标路径]
    */
   exists(file) {
-    return this.is(file, FS.constants.R_OK)
+    return this.is(file, FS.constants.F_OK)
   },
 
   // 是否可读写
diff --git a/index.mjs b/index.mjs
index e0434f6..15c102d 100644
--- a/index.mjs
+++ b/index.mjs
@@ -21,10 +21,7 @@ class STATS {
   }
 }
 
-const VERSION = +process.versions.node
-  .split('.')
-  .slice(0, 2)
-  .join('.')
+const VERSION = +process.versions.node.split('.').slice(0, 2).join('.')
 
 const EMPTY_STAT = new STATS()
 
@@ -288,7 +285,7 @@ export default {
    * @param  {String} file [目标路径]
    */
   exists(file) {
-    return this.is(file, FS.constants.R_OK)
+    return this.is(file, FS.constants.F_OK)
   },
 
   // 是否可读写
diff --git a/package.json b/package.json
index d541340..2a2748f 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,13 @@
     "type": "git",
     "url": "https://github.com/bytedo/iofs.git"
   },
-  "keywords": ["fivejs", "fs", "iofs", "fs.io", "file"],
+  "keywords": [
+    "fivejs",
+    "fs",
+    "iofs",
+    "fs.io",
+    "file"
+  ],
   "author": "yutent",
   "license": "MIT"
 }