chore: remove fixing 404 of hit back button

Author: ulivz

docs/README.md

@@ -15,7 +15,7 @@ footer: MIT Licensed | Copyright © 2018-present Evan You
 
 ### As Easy as 1, 2, 3
 
-[尤](./尤.md)
+- [尤](./尤.md)
 
 ``` bash
 # install

docs/尤.md

@@ -0,0 +1,3 @@
+# 尤
+
+- [雨](./雨.md)

docs/溪.md

@@ -0,0 +1,3 @@
+# 溪
+
+- [Homepage](./)

docs/雨.md

@@ -0,0 +1,3 @@
+# 雨
+
+- [溪](./溪.md)

lib/app/app.js

@@ -83,16 +83,6 @@ export function createApp () {
     }
   })
 
-  // Fix when the two adjacent records in the browser's history contain same state, but have the different url,
-  // which will cause Vue-Router to match 404.
-  let lastHistoryState
-  window.addEventListener('popstate', event => {
-    if (event.state !== null && JSON.stringify(event.state) === JSON.stringify(lastHistoryState)) {
-      history.back()
-    }
-    lastHistoryState = event.state
-  }, false)
-
   const options = {}
 
   themeEnhanceApp({ Vue, options, router, siteData })

lib/app/cache.js

@@ -0,0 +1,17 @@
+export default {
+  set (itemName, item) {
+    sessionStorage.setItem(itemName, JSON.stringify(item))
+  },
+  get (itemName) {
+    let item
+    try {
+      item = JSON.parse(sessionStorage.getItem(itemName))
+    } catch (err) {
+      item = null
+    }
+    return item
+  },
+  clear (itemName) {
+    sessionStorage.removeItem(itemName)
+  }
+}