asPadding method
转换为 Padding,内边距
Implementation
Padding asPadding(EdgeInsetsGeometry padding) {
  return Padding(
    padding: padding,
    child: this,
  );
}转换为 Padding,内边距
Padding asPadding(EdgeInsetsGeometry padding) {
  return Padding(
    padding: padding,
    child: this,
  );
}