[improvement] props default value (#2183)

packages/picker/PickerColumn.vue

@@ -38,15 +38,9 @@ export default create({
     valueKey: String,
     className: String,
     itemHeight: Number,
-    visibleItemCount: Number,
-    initialOptions: {
-      type: Array,
-      default: () => []
-    },
-    defaultIndex: {
-      type: Number,
-      default: 0
-    }
+    defaultIndex: Number,
+    initialOptions: Array,
+    visibleItemCount: Number
   },
 
   data() {

packages/picker/index.vue

@@ -71,6 +71,7 @@ export default create({
 
   props: {
     title: String,
+    columns: Array,
     loading: Boolean,
     showToolbar: Boolean,
     confirmButtonText: String,
@@ -86,10 +87,6 @@ export default create({
     itemHeight: {
       type: Number,
       default: 44
-    },
-    columns: {
-      type: Array,
-      default: () => []
     }
   },
 

packages/picker/test/__snapshots__/index.spec.js.snap

@@ -1,7 +1,7 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
 exports[`column watch default index 1`] = `
-<div class="van-picker-column">
+<div class="van-picker-column" style="height: 0px;">
   <ul style="line-height: 50px;">
     <li class="van-ellipsis van-picker-column__item van-picker-column__item--disabled" style="height: 50px;">1</li>
     <li class="van-ellipsis van-picker-column__item van-picker-column__item--selected" style="height: 50px;">1990</li>
@@ -15,7 +15,7 @@ exports[`column watch default index 1`] = `
 `;
 
 exports[`column watch default index 2`] = `
-<div class="van-picker-column">
+<div class="van-picker-column" style="height: 0px;">
   <ul style="line-height: 50px;">
     <li class="van-ellipsis van-picker-column__item van-picker-column__item--disabled" style="height: 50px;">1</li>
     <li class="van-ellipsis van-picker-column__item" style="height: 50px;">1990</li>