layout : {
type : 'hbox',
pack : 'end'
}
buttonAlign:'center', //按钮居中
Controls how the child items of the container are packed together. Acceptable configuration values for this property are:
- start - child items are packed together at left (HBox) or top (VBox) side of container (*default**)
- center - child items are packed together at mid-width (HBox) or mid-height (VBox) of container
- end - child items are packed together at right (HBox) or bottom (VBox) side of container
Defaults to: 'start'