Dart语言概述

GridView(
  gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
      //横轴两个子widget
      crossAxisCount: 2,
      //宽高比为1时，子widget
      childAspectRatio: 1.0 
  ),
  children:<Widget>[
    Icon(Icons.ac_unit),
    Icon(Icons.airport_shuttle),
    Icon(Icons.all_inclusive),
    Icon(Icons.beach_access),
    Icon(Icons.cake),
    Icon(Icons.free_breakfast)
  ]
);