tweak

src/chart/line/LineSeries.js

@@ -26,6 +26,8 @@ define(function(require) {
             xAxisIndex: 0,
             yAxisIndex: 0,
 
+            polarIndex: 0,
+
             label: {
                 normal: {
                     // show: false,

src/coord/axisDefault.js

@@ -92,7 +92,7 @@ define(function (require) {
         }
     }, defaultOption);
 
-    var valueAxis = zrUtil.merge({
+    var valueAxis = zrUtil.defaults({
         // 数值起始和结束两端空白策略
         boundaryGap: [0, 0],
         // 最小值, 设置成 'dataMin' 则从数据中计算最小值
@@ -106,12 +106,12 @@ define(function (require) {
     }, defaultOption);
 
     // FIXME
-    var timeAxis = zrUtil.merge({
+    var timeAxis = zrUtil.defaults({
         scale: true,
         min: 'dataMin',
         max: 'dataMax'
     }, valueAxis);
-    var logAxis = zrUtil.merge({}, valueAxis);
+    var logAxis = zrUtil.defaults({}, valueAxis);
     logAxis.scale = true;
 
     return {

src/coord/cartesian/Grid.js

@@ -218,13 +218,11 @@ define(function(require, factory) {
                 // onZero can not be used in these two situations
                 // 1. When other axis is a category axis
                 // 2. When other axis not across 0 point
-                if (xAxis.type === 'category'
-                    || !ifAxisCrossZero(xAxis)
+                if (xAxis.type === 'category' || !ifAxisCrossZero(xAxis)
                 ) {
                     yAxis.onZero = false;
                 }
-                if (yAxis.type === 'category'
-                  || !ifAxisCrossZero(yAxis)
+                if (yAxis.type === 'category' || !ifAxisCrossZero(yAxis)
                 ) {
                     xAxis.onZero = false;
                 }