效果：用法：複製並貼上程式碼到新建的qml檔案中;在main.qml中呼叫；將程式碼中的main_Window修改為你的main.qml的id;程式碼

import QtQuick 2.0import QtQuick.Controls 2.5import QtQuick.Controls.Styles 1.4Item {    id:i_BasicFunc    width: 90    height: 30    anchors.top: parent.top    anchors.right: parent.right    property var btn_BGColor: "#00000000"    property var text_Color: "white"    property bool b_IsTheZoom: false    //行的背景大小及顏色 方便檢視行的區域    Rectangle{        id:i_Rec        anchors.fill: parent        color: "#00000000"    }    Row{        anchors.fill: parent        //最小化按鈕        Button{            id:minBtn            width: parent.height            height: parent.height            Text{                text: "-"                color: text_Color                anchors.centerIn: parent                font.bold: true                font.pointSize: 14            }            background: Rectangle{                //當滑鼠移入移出以及按下抬起時，背景顏色發生相應的改變                color: parent.hovered?(parent.pressed?"#b9b9b9":"#a0a0a0"):btn_BGColor            }            onClicked: {                //主視窗id+showMinimized() 最小化視窗                main_Window.showMinimized()            }        }        //最大化及正常顯示按鈕        Button{            id:maxBtn            width: parent.height            height: parent.height            Text{                text: "❐"                color: text_Color                anchors.centerIn: parent                font.bold: true                font.pointSize: 10            }            background: Rectangle{                color: parent.hovered?(parent.pressed?"#b9b9b9":"#a0a0a0"):btn_BGColor            }            onClicked: {                //加入bool變數判斷當前視窗處於什麼狀態                if(!b_IsTheZoom){                    b_IsTheZoom = true                    main_Window.showMaximized()//最大顯示                }else{                    b_IsTheZoom = false                    main_Window.showNormal()//正常顯示                }            }        }        //退出按鈕        Button{            id:closeBtn            width: parent.height            height: parent.height            Text{                text: "×"                color: text_Color                anchors.centerIn: parent                font.bold: true                font.pointSize: 12            }            background: Rectangle{                color: parent.hovered?(parent.pressed?"#b9b9b9":"#a0a0a0"):btn_BGColor            }            onClicked: {                Qt.quit()//退出            }        }    }}