diff --git a/test/dataset-layout.html b/test/dataset-layout.html
index faeaa90a43..42cf3d44d9 100644
--- a/test/dataset-layout.html
+++ b/test/dataset-layout.html
@@ -209,7 +209,7 @@
                     var xAxisInfo = event.axesInfo[0];
                     if (xAxisInfo) {
                         var dimension = xAxisInfo.value + 1;
-                        if(curDimension === dimension){
+                        if (curDimension !== dimension) {
                             curDimension = dimension;
                             chart.setOption({
                                 series: {