1、错误一：qrc:/main.qml:30:5: QML Frame: Cannot anchor to an item that isn't a parent or sibling.

QML的anchor必须定位父级对象或者同级对象，不能定位到其他如：同级对象的子对象。

//main.qml
import QtQuick 2.0
import QtQuick.Controls 2.12
import QtQuick.Layouts 1.12
import QtQuick.Controls 1.4ApplicationWindow {id: windowvisible: truewidth: 500height: 320Frame {id: f0Frame {id: f1width: 100height: 100background: Rectangle {color: "red"}// 必须首先设置锚点，然后才能设置margin，否则不生效anchors.left: parent.leftanchors.top: parent.topanchors.leftMargin: 10anchors.topMargin: 10}}Frame {id: f2width: 100height: 100background: Rectangle {color: "green"}anchors.top: f1.bottomanchors.left: f1.rightanchors.leftMargin: 10}
}

运行上述错误，原因就是在f2中锚定位了与其同级对象f0的子对象f1了。