get(String propertyName)

var  chart =  new  CanvasJS("container",
{ 
    .
    .
    axisX: {
        stripLines: [{
            value: 10,
            label: "Stripline"
        },
        .
        ],
        .
    },
    .
    .
});
chart.render();

Console.log(chart.axisX[0].stripLines[0].get("label"));