text: const install = function (Vue) {
    const Bus = new Vue({
      methods: {
        emit(event, ...args) {
          this.$emit(event, ...args);
        },
        on(event, callback) {
          this.$on(event, callback);
        },
        off(event, callback) {
          this.$off(event, callback);
        }
      }
    });
    Vue.prototype.$bus=Bus; 
  };
  export default install;