问自定义jQuery函数随机未定义

EN

$.fn.barChart = function (options, callback) {
    $.ajax(options["url"], {
        method: "POST",
        type: "json",
        data: options.data,
        success: function (response) {

            // ..render this chart ..

            var optionsForNewChart = {}; // ..generate new options to respond with base on response JSON
            callback(optionsForNewChart);
        }
    });
};

$.fn.lineChart = function (options) {
    $.ajax(options["url"], {
        method: "POST",
        type: "json",
        data: options.data,
        success: function (response) {
            // ..render this chart ..
        }
    });
}


$("#barChart1").barChart({
    url: "https://...",
    data: {
        //post data
    }
}, function (response) {
    $('#lineChart1').lineChart(response);
});

$("#barChart2").barChart({
    url: "https://...",
    data: {
        //post data
    }
}, function (response) {
    $('#lineChart2').lineChart(response);
});

$("#barChart3").barChart({
    url: "https://...",
    data: {
        //post data
    }
}, function (response) {
    $('#lineChart3').lineChart(response);
});