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node_modules/vant/es/mixins/portal.js

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+function getElement(selector) {
+  if (typeof selector === 'string') {
+    return document.querySelector(selector);
+  }
+
+  return selector();
+}
+
+export function PortalMixin(_temp) {
+  var _ref = _temp === void 0 ? {} : _temp,
+      ref = _ref.ref,
+      afterPortal = _ref.afterPortal;
+
+  return {
+    props: {
+      getContainer: [String, Function]
+    },
+    watch: {
+      getContainer: 'portal'
+    },
+    mounted: function mounted() {
+      if (this.getContainer) {
+        this.portal();
+      }
+    },
+    methods: {
+      portal: function portal() {
+        var getContainer = this.getContainer;
+        var el = ref ? this.$refs[ref] : this.$el;
+        var container;
+
+        if (getContainer) {
+          container = getElement(getContainer);
+        } else if (this.$parent) {
+          container = this.$parent.$el;
+        }
+
+        if (container && container !== el.parentNode) {
+          container.appendChild(el);
+        }
+
+        if (afterPortal) {
+          afterPortal.call(this);
+        }
+      }
+    }
+  };
+}