Function eachCtx

test/lib/testHelper.js:1629–1643

(cb)

        });

        function eachCtx(cb) {
            var painter = chart.getZr().painter;
            if (painter.type !== 'canvas') {
                return;
            }
            var layers = painter.getLayers();
            for (var zlevel in layers) {
                if (layers.hasOwnProperty(zlevel)) {
                    var layer = layers[zlevel];
                    var canvas = layer.dom;
                    var ctx = canvas.getContext('2d');
                    cb(zlevel, ctx);
                }
            }
        }
    }

    /**