vue解决移动端和pc端适配

 //App.vue
  mounted() {
      if (this._isMobile()) {
        alert("手机端");
        // this.$router.replace(‘/m_index‘);
      } else {
        alert("pc端");
        // this.$router.replace(‘/pc_index‘);
      }
    },
    methods: {
      //App.vue
      _isMobile() {
        let flag = navigator.userAgent.match(/(phone|pad|pod|iPhone|iPod|ios|iPad|Android|Mobile|BlackBerry|IEMobile|MQQBrowser|JUC|Fennec|wOSBrowser|BrowserNG|WebOS|Symbian|Windows Phone)/i)
        return flag;
      }
  }