Revert "Merge branch 'master' of https://github.com/yangmingshan/history

 into yangmingshan-master"

This reverts commit 54e8948.

modules/DOMUtils.js

@@ -45,24 +45,10 @@ export function supportsGoWithoutReloadUsingHash() {
 }
 
 /**
- * Returns true if a given popstate event is an extraneous WebKit event,
- * or it fired on initial page load (the solution is from page.js [https://github.com/visionmedia/page.js]).
+ * Returns true if a given popstate event is an extraneous WebKit event.
  * Accounts for the fact that Chrome on iOS fires real popstate events
  * containing undefined state when pressing the back button.
  */
-export const shouldIgnorePopstateEvent = (() => {
-  let loaded = false;
-  if (document.readyState === 'complete') {
-    loaded = true;
-  } else {
-    window.addEventListener('load', () =>
-      setTimeout(() => {
-        loaded = true;
-      })
-    );
-  }
-  return event =>
-    (event.state === undefined &&
-      navigator.userAgent.indexOf('CriOS') === -1) ||
-    !loaded;
-})();
+export function isExtraneousPopstateEvent(event) {
+  return event.state === undefined && navigator.userAgent.indexOf('CriOS') === -1;
+}

modules/createBrowserHistory.js

@@ -12,7 +12,7 @@ import {
   getConfirmation,
   supportsHistory,
   supportsPopStateOnHashChange,
-  shouldIgnorePopstateEvent
+  isExtraneousPopstateEvent
 } from './DOMUtils.js';
 import invariant from './invariant.js';
 import warning from './warning.js';
@@ -86,7 +86,8 @@ function createBrowserHistory(props = {}) {
   }
 
   function handlePopState(event) {
-    if (shouldIgnorePopstateEvent(event)) return;
+    // Ignore extraneous popstate events in WebKit.
+    if (isExtraneousPopstateEvent(event)) return;
     handlePop(getDOMLocation(event.state));
   }