动态加载qml

当主qml包含子qml时，分静态加载qml和动态加载qml，其中动态加载qml可以按需加载qml资源，避免子qml资源加载过长时，影响主qml整体加载性能。

1.静态加载qml

 Window {
    property bool bBtnPressed: false

    width: 640
    height: 480
    visible: true
    title: qsTr("loader测试")
   
    LoaderPage{
        id:page
        anchors.top: parent.top
        anchors.topMargin:  100

        anchors.left: parent.left
        anchors.leftMargin: 50
    }
}

2.动态加载qml

Window {
    property bool bBtnPressed: false

    width: 640
    height: 480
    visible: true
    title: qsTr("loader测试")

    Rectangle {
        width: 400
        height: 50
        anchors.top: parent.top
        anchors.topMargin: 20
        anchors.left: parent.left
        anchors.leftMargin: 200
        Row {
            spacing: 5

            anchors.fill: parent
            Button {
                text: bBtnPressed ? qsTr("动态卸载") : qsTr("动态加载")
                onClicked: {
                    bBtnPressed = !bBtnPressed;
                    if (bBtnPressed){
                        loadPage.source = "LoaderPage.qml"
                    }else{
                        loadPage.source = "";
                    }
                }
            }
        }
    }
    Loader {
        id: loadPage
        anchors.top: parent.top
        anchors.topMargin: 100
        anchors.left: parent.left
        anchors.leftMargin: 200
    }
}