docs(dual-axes): 双轴图补充meta使用示例 (#2314)

close: #2313 Co-authored-by: kasmine <visiky>
antvis · Feb 7, 2021 · 0e7b260 · 0e7b260
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diff --git a/docs/api/plots/dual-axes.en.md b/docs/api/plots/dual-axes.en.md
@@ -35,6 +35,23 @@ The array of data field names to which the dot shape maps in the Y direction is
 
 `markdown:docs/common/meta.en.md`
 
+
+Example:
+
+```ts
+{
+  yField: ['value1', 'value2'],
+  meta: {
+    value1: {
+      alias: 'temperature',
+    },
+    value2: {
+      alias: 'altitude'
+    }
+  }
+}
+```
+
 ### Geometry Style
 
 #### geometryOptions

diff --git a/docs/api/plots/dual-axes.zh.md b/docs/api/plots/dual-axes.zh.md
@@ -35,6 +35,22 @@ const data = [[{ time: '1991'，value: 20 }], [{ time: '1992', count: 20 }]];
 
 `markdown:docs/common/meta.zh.md`
 
+使用示例：
+
+```ts
+{
+  yField: ['value1', 'value2'],
+  meta: {
+    value1: {
+      alias: '温度',
+    },
+    value2: {
+      alias: '海拔'
+    }
+  }
+}
+```
+
 ### 图形样式
 
 #### geometryOptions