text: var isIPhoneX = null;
  
  function getIsIPhoneX() {
    return new Promise(function (resolve, reject) {
      if (isIPhoneX !== null) {
        resolve(isIPhoneX);
      } else {
        wx.getSystemInfo({
          success: function success(_ref) {
            var model = _ref.model,
                screenHeight = _ref.screenHeight;
            var iphoneX = /iphone x/i.test(model);
            var iphoneNew = /iPhone11/i.test(model) && screenHeight === 812;
            isIPhoneX = iphoneX || iphoneNew;
            resolve(isIPhoneX);
          },
          fail: reject
        });
      }
    });
  }
  
  export var iphonex = Behavior({
    properties: {
      safeAreaInsetBottom: {
        type: Boolean,
        value: true
      }
    },
    created: function created() {
      var _this = this;
  
      getIsIPhoneX().then(function (isIPhoneX) {
        _this.set({
          isIPhoneX: isIPhoneX
        });
      });
    }
  });