Qml之别名引用

import QtQuick 2.5
import QtQuick.Window 2.0 as My

My.Window {
    property alias rectWidth: rect.width

    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")

    Rectangle {
        id: rect
        width: 100; height: 200
        color: "red"
    }
}