refactor: remove enquireScreen function from device.js to util.js; 🌟

重构：把 enquireScreen 功能从 device.js 迁移至 util.js；

src/utils/device.js

@@ -1,15 +0,0 @@
-import enquireJs from 'enquire.js'
-
-const enquireScreen = function (call) {
-  const hanlder = {
-    match: function () {
-      call && call(true)
-    },
-    unmatch: function () {
-      call && call(false)
-    }
-  }
-  enquireJs.register('only screen and (max-width: 767.99px)', hanlder)
-}
-
-export default enquireScreen

src/utils/util.js

@@ -1,3 +1,5 @@
+import enquireJs from 'enquire.js'
+
 export function isDef (v){
   return v !== undefined && v !== null
 }
@@ -18,4 +20,16 @@ export function isRegExp (v) {
   return _toString.call(v) === '[object RegExp]'
 }
 
+export function enquireScreen(call) {
+  const handler = {
+    match: function () {
+      call && call(true)
+    },
+    unmatch: function () {
+      call && call(false)
+    }
+  }
+  enquireJs.register('only screen and (max-width: 767.99px)', handler)
+}
+
 const _toString = Object.prototype.toString