问如何将.csv文件加载到带有d3的交叉过滤器中？

EN

 var ndx;

 private method(){

        var data_;

        d3.csv("samples.csv", function(data){

            var format = d3.timeParse("%m-%y"); 

            data.forEach(function(d: any) {
                d.date = format(d.date);
            });

            data_ = d3.csvParse(data);
        });

        ndx = crossfilter(data_);
}

 var ndx;

 private method(){

        var data_ = (function() {
            var json: any = null;
            $.ajax({
                'async': false,
                'global': false,
                'url': "samples.json",
                'dataType': "json",
                'success': function (data:any) {
                    json = data;
                }
            });
            return json;
        })(); 

        ndx = crossfilter(data_);
}