vant/src/mixins/close-on-popstate.ts

import Vue from 'vue';
import { on, off } from '../utils/dom/event';
import { BindEventMixin } from './bind-event';

export const CloseOnPopstateMixin = Vue.extend({
  mixins: [
    BindEventMixin(function(this: any, bind, isBind) {
      this.handlePopstate(isBind && this.closeOnPopstate);
    }),
  ],

  props: {
    closeOnPopstate: Boolean,
  },

  data() {
    return {
      bindStatus: false,
    };
  },

  watch: {
    closeOnPopstate(val: boolean) {
      this.handlePopstate(val);
    },
  },

  methods: {
    handlePopstate(bind: boolean) {
      /* istanbul ignore if */
      if (this.$isServer) {
        return;
      }

      if (this.bindStatus !== bind) {
        this.bindStatus = bind;
        const action = bind ? on : off;
        action(window, 'popstate', (this as any).close);
      }
    },
  },
});