qml js

        Rectangle{
            id:rect2;
            width: 100;
            height: 100;
            function startup(){
                console.log("xxxdddx");
            }
            Component.onCompleted: startup();
        }

    Component.onCompleted: {
        var component = Qt.createComponent("SelfDestoryingRect.qml");
        for(var i=0; i < 5; i++)
        {
            var object1 = component.createObject(container);
            object1.x = (object1.width + 10) * i;
        }
    }

import QtQuick 2.0

Rectangle{
    id:rect1;
    width: 100;
    height: 100;
    color: "red";
    NumberAnimation on opacity {
        to:0;
        duration: 1000;
        onRunningChanged: {
            if(!running)
            {
                console.log("Destroying");
                rect1.destroy();
            }
        }
    }
}

import QtQuick 2.9
import QtQuick.Window 2.2

Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")
    Calculator{
        x:10;
        y:20;
        input: 2;
    }
    Calculator{
        x:40;
        y:50;
        input: 3;
    }
}

import QtQuick 2.0
import "./factorial.js" as FactorialCalculator

Text {
    id: text1;
    property int input: 17;
    text: qsTr("text"+input+ "is" + FactorialCalculator.factorial(input)+"/***=*/"+ FactorialCalculator.factiorialCallCount());
}

.pragma library
var factorialCount = 0;
function factorial(a) {
    a = parseInt(a);
    if(a > 0)
    {
        console.log(a);
        return a * factorial(a-1);
    }
    console.log("factorialCount:"+factorialCount);
    factorialCount +=1;
    return 1;
}

function factiorialCallCount(){
    console.log("factorialCount():"+factorialCount);
    return factorialCount;
}