[Improvement] SubmitBar: support custom currency symbol (#876)

docs/markdown/en-US/card.md

@@ -49,6 +49,7 @@ Use `slot` to custom content.
 | num | Number of goods | `String | Number` | - | - |
 | price | Price of goods | `String | Number` | - | - |
 | centered | Whether content vertical centered | `String` | `false` | - |
+| currency | Currency symbol |  `String` | `¥` | - |
 
 ### Slot
 

docs/markdown/en-US/submit-bar.md

@@ -71,6 +71,7 @@ Use slot to add custom contents.
 | tip | Tip |  `String` | - | - |
 | disabled | Whether to disable button |  `Boolean` | `false` | - |
 | loading | Whether to show loading icon |  `Boolean` | `false` | - |
+| currency | Currency symbol |  `String` | `¥` | - |
 
 ### Event
 

docs/markdown/zh-CN/card.md

@@ -49,6 +49,7 @@ Vue.use(Card);
 | num | 商品数量 | `String | Number` | - | - |
 | price | 商品价格 | `String | Number` | - | - |
 | centered | 内容是否垂直居中 | `String` | `false` | - |
+| currency | 货币符号 |  `String` | `¥` | - |
 
 ### Slot
 

docs/markdown/zh-CN/submit-bar.md

@@ -71,6 +71,7 @@ Vue.use(SubmitBar);
 | tip | 提示文案 |  `String` | - | - |
 | disabled | 是否禁用按钮 |  `Boolean` | `false` | - |
 | loading | 是否显示加载中的按钮 |  `Boolean` | `false` | - |
+| currency | 货币符号 |  `String` | `¥` | - |
 
 ### Event