qml使用消息对话框

```css
import QtQuick
import QtQuick.Window
import QtQuick.Controls

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

//    试图将ListModel中的正则表达式传入到Component的RegExpression
    ListModel {
        id:contactModel

        property var regExpression1:/^[0-9]+$/
        property var regExpression2:/^[a-z]+$/

        property bool completed: false


        Component.onCompleted: {
            contactModel.append({"input": "0-9","value":"^[0-9]+$"})
            contactModel.append({"input": "a-z","value":"^[a-z]+$"})
            completed = true

            console.log(contactModel.get(0).input)
            console.log(contactModel.get(1).input)
            console.log(contactModel.get(0).value)
            console.log(contactModel.get(1).value)
        }


        onRegExpression1Changed: {
            if(completed) setProperty(0, "value", contactModel.regExpression1);
        }
        onRegExpression2Changed: {
            if(completed) setProperty(1, "value", contactModel.regExpression2);
        }
    }

    Component{
        id:contactsDelegate
        TextField {
            placeholderText: input
            validator:RegularExpressionValidator {regularExpression:RegExp(value)}
        }
    }


    ListView {
        id:listView
        anchors.fill: parent
        model: contactModel
        delegate: contactsDelegate
    }
}