doc: add doc for stackOrder

en/option/series/bar.md

@@ -157,6 +157,18 @@ How to stack values if the [stack](~series-bar.stack) property has been set. Opt
 + `'positive'`: only stack positive values.
 + `'negative'`: only stack negative values.
 
+## stackOrder(string) = 'seriesAsc'
+
+{{ use: partial-version(
+    version = '6.0.0'
+) }}
+
+Stack order. Optional values:
++ `'seriesAsc'` (default, stack in series order)
++ `'seriesDesc'` (reverse stack order)
+
+Not supported in polar coordinate system.
+
 ## sampling(string)
 
 The downsampling strategy used when the data size is much larger than pixel size. It will improve the performance when turned on. Defaults to be turned off, indicating that all the data points will be drawn.

en/option/series/line.md

@@ -81,6 +81,18 @@ How to stack values if the [stack](~series-line.stack) property has been set. Op
 + `'positive'`: only stack positive values.
 + `'negative'`: only stack negative values.
 
+## stackOrder(string) = 'seriesAsc'
+
+{{ use: partial-version(
+    version = '6.0.0'
+) }}
+
+Stack order. Optional values:
++ `'seriesAsc'` (default, stack in series order)
++ `'seriesDesc'` (reverse stack order)
+
+Not supported in polar coordinate system.
+
 {{ use: partial-cursor() }}
 
 ## connectNulls(boolean) = false

zh/option/series/bar.md

@@ -233,6 +233,18 @@ option = {
 + `'positive'` 只堆积正值。
 + `'negative'` 只堆叠负值。
 
+## stackOrder(string) = 'seriesAsc'
+
+{{ use: partial-version(
+    version = '6.0.0'
+) }}
+
+堆叠顺序。可选值：
++ `'seriesAsc'`（默认，系列顺序堆叠）
++ `'seriesDesc'`（反向堆叠）
+
+当前不支持极坐标系。
+
 ## sampling(string)
 
 柱状图在数据量远大于像素点时候的降采样策略，开启后可以有效的优化图表的绘制效率，默认关闭，也就是全部绘制不过滤数据点。

zh/option/series/line.md

@@ -108,6 +108,18 @@ const option = {
 + `'positive'` 只堆积正值。
 + `'negative'` 只堆叠负值。
 
+## stackOrder(string) = 'seriesAsc'
+
+{{ use: partial-version(
+    version = '6.0.0'
+) }}
+
+堆叠顺序。可选值：
++ `'seriesAsc'`（默认，系列顺序堆叠）
++ `'seriesDesc'`（反向堆叠）
+
+当前不支持极坐标系。
+
 {{ use: partial-cursor() }}
 
 ## connectNulls(boolean) = false