问如何创建无列数据类型的tableau wdc？

EN

(function () {
    var myConnector = tableau.makeConnector();

    myConnector.getSchema = function (schemaCallback) {
        var cols = [{
            id: "id",
            dataType: tableau.dataTypeEnum.string
        }, {
            id: "mag",
            dataType: tableau.dataTypeEnum.float
           // dataType: tableau.dataTypeEnum.string

        }, {
            id: "title",
            dataType: tableau.dataTypeEnum.string

        }, {
            id: "location",
            dataType: tableau.dataTypeEnum.geometry
            //dataType: tableau.dataTypeEnum.string

        }];

        var tableSchema = {
            id: "earthquakeFeed",
            columns: cols
        };

        schemaCallback([tableSchema]);
    };
    myConnector.getData = function(table, doneCallback) {
        $.getJSON("https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/4.5_week.geojson", function(resp) {
            var feat = resp.features,
                tableData = [];

            // Iterate over the JSON object
            for (var i = 0, len = feat.length; i < len; i++) {
                tableData.push({
                    "id": feat[i].id,
                    "mag": feat[i].properties.mag,
                    "title": feat[i].properties.title,
                    "location": feat[i].geometry
                });
            }

            table.appendRows(tableData);
            doneCallback();
        });
    };
    $(document).ready(function () {
        $("#submitButton").click(function () {
            tableau.connectionName = "USGS Earthquake Feed";
            tableau.submit();
        });
    });

    tableau.registerConnector(myConnector);
})();