Cascader: add separator prop

examples/docs/en-US/cascader.md

@@ -1669,6 +1669,7 @@ Search and select options with a keyword.
 | options   | data of the options | array | — | — |
 | props | configuration options, see the following table | object | — | — |
 | value | selected value | array | — | — |
+| separator | option separator | string | — | / |
 | popper-class | custom class name for Cascader's dropdown | string | — | — |
 | placeholder | input placeholder | string | — | Select |
 | disabled  | whether Cascader is disabled | boolean |  — | false |

examples/docs/zh-CN/cascader.md

@@ -1669,6 +1669,7 @@
 | options | 可选项数据源，键名可通过 `props` 属性配置 | array | — | — |
 | props | 配置选项，具体见下表 | object | — | — |
 | value | 选中项绑定值   | array | — | — |
+| separator | 选项分隔符 | string | — | 斜杠'/' |
 | popper-class | 自定义浮层类名   | string | —  | — |
 | placeholder | 输入框占位文本 | string | — | 请选择 |
 | disabled | 是否禁用 | boolean | — | false |

packages/cascader/src/main.vue

@@ -46,7 +46,7 @@
       <template v-if="showAllLevels">
         <template v-for="(label, index) in currentLabels">
           {{ label }}
-          <span v-if="index < currentLabels.length - 1"> / </span>
+          <span v-if="index < currentLabels.length - 1"> {{ separator }} </span>
         </template>
       </template>
       <template v-else>
@@ -123,6 +123,10 @@ export default {
         return [];
       }
     },
+    separator: {
+      type: String,
+      default: '/'
+    },
     placeholder: {
       type: String,
       default() {