阻止路由跳轉，以及路由重定向

在main.js 文件中

import router from './router'
router.beforeEach((to, from, next) => {
  // 阻止路由跳轉
  if (滿足阻止條件時) {
      next(false)
      return false
  }
  // 如果傳入的url中有token，則不必跳轉登錄頁
  if (window.location.href.indexOf('token') > -1 && window.location.href.indexOf('?') > -1 && (router.mode === 'hash' || router.mode === 'history')) {
      let params = ''
      if (router.mode === 'hash') {
        params = window.location.href.split('#')[1]
        params = params.split('?')[1]
      } else {
        params = window.location.href.split('?')[1]
      }
      let paramsArray = params.split('&')
      let query = Object.create(null)
      paramsArray.forEach(elem => {
        let e = elem.split('=')
        query[e[0]] = e[1]
      })
      store.commit('userInfo', query)
      $axios.defaults.headers.Authorization = 'Bearer ' + query.token // 防止登錄成功token還是undefined
      next()
  } else if (to.path === '/login' || store.state.userInfo.token) {
    next()
  } else {
    next('/login')
  }
  return false
})