Win7系统里IE11浏览器里的vue-router返回不生效？

// 单页的App.vue文件里混入进去hashchangeMixin
import {
  hashchangeMixin
} from '@/assets/js/hashchange.js'
export default {
  mixins: [hashchangeMixin]
}

// 统一处理 vue-router 在IE下不跳转问题 单独的hashchange.js文件
export const hashchangeMixin = {
  mounted () {
    if (this.checkIE()) {
      window.addEventListener('hashchange', () => {
        let currentPath = window.location.hash.slice(1)
        if (this.$route.path !== currentPath) {
          this.$router.push(currentPath)
        }
      }, false)
    }
  },
  methods: {
    // 是否是IE
    checkIE () {
      return (
        '-ms-scroll-limit' in document.documentElement.style &&
          '-ms-ime-align' in document.documentElement.style
      )
    }
  }
}