Merge branch 'dev' into next

src/picker/README.md

@@ -285,7 +285,7 @@ Picker events will pass different parameters according to the columns are single
 
 ### Methods
 
-Use [ref](https://vuejs.org/v2/api/#ref) to get Picker instance and call instance methods
+Use [ref](https://vuejs.org/v2/api/#ref) to get Picker instance and call instance methods.
 
 | Name | Description | Attribute | Return value |
 | --- | --- | --- | --- |

src/picker/README.zh-CN.md

@@ -310,7 +310,7 @@ export default {
 
 ### 方法
 
-通过 ref 可以获取到 Picker 实例并调用实例方法，详见[组件实例方法](#/zh-CN/quickstart#zu-jian-shi-li-fang-fa)
+通过 ref 可以获取到 Picker 实例并调用实例方法，详见[组件实例方法](#/zh-CN/quickstart#zu-jian-shi-li-fang-fa)。
 
 | 方法名 | 说明 | 参数 | 返回值 |
 | --- | --- | --- | --- |

src/picker/index.less

@@ -54,7 +54,7 @@
     right: 0;
     bottom: 0;
     left: 0;
-    z-index: 2;
+    z-index: 3;
     display: flex;
     align-items: center;
     justify-content: center;
@@ -67,7 +67,7 @@
     top: 50%;
     right: @padding-md;
     left: @padding-md;
-    z-index: 3;
+    z-index: 2;
     transform: translateY(-50%);
     pointer-events: none;
   }
@@ -76,7 +76,7 @@
     position: absolute;
     top: 0;
     left: 0;
-    z-index: 2;
+    z-index: 1;
     width: 100%;
     height: 100%;
     background-image: linear-gradient(