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node_modules/vant/es/mixins/close-on-popstate.js

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+import { on, off } from '../utils/dom/event';
+import { BindEventMixin } from './bind-event';
+export var CloseOnPopstateMixin = {
+  mixins: [BindEventMixin(function (bind, isBind) {
+    this.handlePopstate(isBind && this.closeOnPopstate);
+  })],
+  props: {
+    closeOnPopstate: Boolean
+  },
+  data: function data() {
+    return {
+      bindStatus: false
+    };
+  },
+  watch: {
+    closeOnPopstate: function closeOnPopstate(val) {
+      this.handlePopstate(val);
+    }
+  },
+  methods: {
+    onPopstate: function onPopstate() {
+      this.close();
+      this.shouldReopen = false;
+    },
+    handlePopstate: function handlePopstate(bind) {
+      /* istanbul ignore if */
+      if (this.$isServer) {
+        return;
+      }
+
+      if (this.bindStatus !== bind) {
+        this.bindStatus = bind;
+        var action = bind ? on : off;
+        action(window, 'popstate', this.onPopstate);
+      }
+    }
+  }
+};