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 Row简介  横向排列内部布局,可容纳多个组件。  
| 属性 | 作用 | 
|---|
 | mainAxisAlignment | 主轴对齐 |  | crossAxisAlignment | 横轴对齐 |  | textBaseline | 文字基线 |  | textDirection | 竖直方向 |  | mainAxisSize | 主轴尺寸 |  | children | 子布局单位:(数组) |   
 
import 'package:flutter/material.dart';
class RowWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Container(
      height: 100,
      color: Colors.yellow,
      child: Row(
       mainAxisAlignment: MainAxisAlignment.start, 
        crossAxisAlignment: CrossAxisAlignment.end,
        children: [
          Container(
            width: 100,
            color: Colors.red,
            child: Text('left'),
          ),
          Container(
            width: 100,
            color: Colors.green,
            child: Text('center'),
          ),
          Container(
            width: 100,
            color: Colors.blueAccent,
            child: Text('right'),
          ),
        ],
      ),
    );
  }
}
  
属性:mainAxisAlignment: MainAxisAlignment.start     属性:mainAxisAlignment: MainAxisAlignment.center  
   属性:mainAxisAlignment: MainAxisAlignment.end     属性:mainAxisAlignment: MainAxisAlignment.spaceBetween     属性:mainAxisAlignment: MainAxisAlignment.spaceAround     属性:mainAxisAlignment: MainAxisAlignment.spaceEvenly     属性:crossAxisAlignment: CrossAxisAlignment.end     属性:crossAxisAlignment: CrossAxisAlignment.start     属性:crossAxisAlignment: CrossAxisAlignment.center     
属性:crossAxisAlignment: CrossAxisAlignment.stretch    
                
                
                
        
        
    
 
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