chore: release 2.12.48

* 添加steps组件alignCenter 的属性

* 设置steps 的 alignCenter在横向时无效

* 修改 Steps API Doc

* 格式化setp代码，并删除无用注释

package.json

@@ -1,6 +1,6 @@
 {
   "name": "vant",
-  "version": "2.12.47",
+  "version": "2.12.48",
   "description": "Mobile UI Components built on Vue",
   "main": "lib/index.js",
   "module": "es/index.js",

src/step/index.js

@@ -23,10 +23,22 @@ export default createComponent({
     },
 
     lineStyle() {
-      if (this.status === 'finish') {
-        return { background: this.parent.activeColor };
+      const { activeColor, inactiveColor, center, direction } = this.parent;
+      const style = {
+        background: this.status === 'finish' ? activeColor : inactiveColor,
+      };
+      if (center && direction === 'vertical') {
+        style.top = '50%';
+      }
+      return style;
+    },
+
+    circleContainerStyle() {
+      if (this.parent.center && this.parent.direction === 'vertical') {
+        return {
+          top: '50%',
+        };
       }
-      return { background: this.parent.inactiveColor };
     },
 
     titleStyle() {
@@ -111,7 +123,11 @@ export default createComponent({
         >
           {this.slots()}
         </div>
-        <div class={bem('circle-container')} onClick={this.onClickStep}>
+        <div
+          class={bem('circle-container')}
+          onClick={this.onClickStep}
+          style={this.circleContainerStyle}
+        >
           {this.genCircle()}
         </div>
         <div class={bem('line')} style={this.lineStyle} />

src/steps/README.md

@@ -77,6 +77,7 @@ export default {
 | inactive-icon | Inactive icon name | _string_ | - |
 | finish-icon `v2.12.7` | Finish icon name | _string_ | - |
 | icon-prefix `v2.12.15` | Icon className prefix | _string_ | `van-icon` |
+| center | Whether to center content when direction is vertical | _boolean_ | `false` |
 
 ### Step Slots
 

src/steps/README.zh-CN.md

@@ -87,6 +87,7 @@ export default {
 | inactive-icon | 未激活状态底部图标，可选值见 [Icon 组件](#/zh-CN/icon) | _string_ | - |
 | finish-icon `v2.12.7` | 已完成步骤对应的底部图标，优先级高于 `inactive-icon`，可选值见 [Icon 组件](#/zh-CN/icon) | _string_ | - |
 | icon-prefix `v2.12.15` | 图标类名前缀，同 Icon 组件的 [class-prefix 属性](#/zh-CN/icon#props) | _string_ | `van-icon` |
+| center | 是否进行居中对齐，仅在竖向展示时有效 |  _boolean_ | `false` |
 
 ### Step Slots
 

src/steps/index.js

@@ -7,6 +7,7 @@ export default createComponent({
   mixins: [ParentMixin('vanSteps')],
 
   props: {
+    center: Boolean,
     iconPrefix: String,
     finishIcon: String,
     activeColor: String,

src/utils/dom/scroll.ts

@@ -6,7 +6,7 @@ function isWindow(val: unknown): val is Window {
 
 // get nearest scroll element
 // https://github.com/youzan/vant/issues/3823
-const overflowScrollReg = /scroll|auto/i;
+const overflowScrollReg = /scroll|auto|overlay/i;
 export function getScroller(el: HTMLElement, root: ScrollElement = window) {
   let node = el;