Cesium entity click

var url = 'http://202.107.245.51:81/user/dev/api/v2/sql?rows_per_page=40&page=0&sort_order=asc&order_by=&filter_column=&filter_value=&sql_source=null&api_key=96f34723cc3398ea5c18d3e75e3de6273a959c01&';
        var country_url = url + 'q=select * from (SELECT *,st_asgeojson(the_geom) FROM country_pop) __wrapped';
        $.ajax({
            url: country_url,
            type: 'GET',
            dataType: 'jsonp'
        })
        .done(function (data) {
            console.log(data);
            console.log(data.rows.length);
            var idArr = [];
            var cid;
            for(var i=0;i<data.rows.length;i++){
                cid = data.rows[i].cartodb_id;
                idArr.push(cid);
                // console.log(cid);
                modValue.quXian[cid] = data.rows[i];
                var cds = eval("("+data.rows[i].st_asgeojson+")").coordinates[0][0];
                var arr = cds[0];for(var j=1;j<cds.length;j++){ arr = arr.concat(cds[j]); }
                var redPolygon = ONEMAP.C.viewer.entities.add({
                    name : 'BLUE polygon on surface',
                    polygon : {
                        hierarchy : Cesium.Cartesian3.fromDegreesArray(arr),
                        material : Cesium.Color.BLUE
                    },
                    id: cid
                });
            }
            var handler = new Cesium.ScreenSpaceEventHandler(ONEMAP.C.viewer.scene.canvas);
                handler.setInputAction(function (movement) {
                    var pick = ONEMAP.C.viewer.scene.pick(movement.position);
                    // if (Cesium.defined(pick) && (pick.id.id === cid)) {
                    if (Cesium.defined(pick) && ($.inArray(pick.id.id, idArr)>-1)) {
                        alert(modValue.quXian[pick.id.id].name);
                    }
                }, Cesium.ScreenSpaceEventType.LEFT_CLICK);
        })
        .fail(function () {
            console.log('获取失败')
        });