vant-weapp/dist/mixins/basic.js

import { classNames } from '../common/class-names';
export var basic = Behavior({
  created: function created() {
    var _this = this;

    wx.getSystemInfo({
      success: function success(_ref) {
        var model = _ref.model,
            screenHeight = _ref.screenHeight;
        var isIphoneX = /iphone x/i.test(model);
        var isIphoneNew = /iPhone11/i.test(model) && screenHeight === 812;

        if (isIphoneX || isIphoneNew) {
          _this.set({
            isIPhoneX: true
          });
        }
      }
    });
  },
  methods: {
    classNames: classNames,
    $emit: function $emit() {
      this.triggerEvent.apply(this, arguments);
    },
    getRect: function getRect(selector, all) {
      var _this2 = this;

      return new Promise(function (resolve) {
        wx.createSelectorQuery().in(_this2)[all ? 'selectAll' : 'select'](selector).boundingClientRect(function (rect) {
          if (all && Array.isArray(rect) && rect.length) {
            resolve(rect);
          }

          if (!all && rect) {
            resolve(rect);
          }
        }).exec();
      });
    }
  }
});