QML使用chartview

import QtQuick 2.0
import QtCharts 2.2
Rectangle {
    id: root
    property string info: "info"
    color: "#000C3C"
    width: 600;
    height: 400;
    function setValue(list_y,txt)
    {
        root.info = txt;
        spline.clear();
        axisY.min = Math.min.apply(null,list_y)
        axisY.max = Math.max.apply(null,list_y)

        for(var i=0;i