优化exists

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

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

package.json

@@ -1,13 +1,19 @@
 {
   "name": "iofs",
-  "version": "1.5.0",
+  "version": "1.5.1",
   "description": "iofs是一个基于原生fs模块封装的工具, 旨在提供更加方便实用一些常用的API方法(同步), API习惯参考了bash shell。",
   "main": "index.js",
   "repository": {
     "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"
 }