//main.qml

import QtQuick 2.12
import QtQuick.Window 2.12

Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")
    property double version: 1.2

    Text {
        id: m_txt
        width: 100
        height: 100
        text: plus2(2, 3)
    }

    //无参
    function myPrint(){
        console.log("print() called.")
    }

    //带参，无返回值
    function plus(num1, num2){
        console.log("plus:" + num1 + " + " + num2 + " = " + (num1 + num2))
    }

    //带参，有返回值
    function plus2(num1, num2){
        return (num1 + num2)
    }

    //程序最后执行
    Component.onCompleted: {
        myPrint()
        plus(1, 2)
    }
}