[bug] beforeEach hooks runs twice

[lmk123]

Vue.js version

2.1.3

vue-router version

2.1.0

Reproduction Link

https://jsfiddle.net/lmk123/qoj2sfb2/

What is Expected?

Alert should only shown once.

What is actually happening?

It shown twice.

[damianstasik]

The first hook execution is done in VueRouter.init:

vue-router/src/index.js

Line 75 in 0e319d4

history.transitionTo(getHash())

The second execution is here:

vue-router/src/history/hash.js

Line 37 in a95795c

this.transitionTo(getHash(), route => {

When the url doesn't contain the hash character, it will append #/ to the url and that will trigger the hashchange event which will run onHashChange and the second execution.

[lmk123]

@visualfanatic Thanks, just now I found this issue is duplicate (#725) and fixed in #735, sorry for my carelessness 😂