// 注册全局Mixin

    Vue.mixin({

      methods: {

        $touch: function() { // 用以同时watch多个字段变化

          return Date.now();

        },

        anotherMethods: function() {

          console.log(8888)

        }

      }

    })

let myMixin = {

  methods: {

    hello: function() {

      console.log('hello from mixin!')

    }

  }

}

mixins: [myMixin],

mounted() {

      console.log(this.hello(), '$hello');

    },