feat: Steps component
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# Steps 步骤条
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### 引入
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```js
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import Vue from 'vue';
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import { Step, Steps } from 'vant';
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Vue.use(Step);
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Vue.use(Steps);
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```
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## 代码演示
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### 基础用法
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`active`属性表示当前步骤的索引,从 0 起计
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```html
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<van-steps :active="active">
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<van-step>买家下单</van-step>
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<van-step>商家接单</van-step>
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<van-step>买家提货</van-step>
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<van-step>交易完成</van-step>
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</van-steps>
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```
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```js
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export default {
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data() {
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return {
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active: 1,
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};
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},
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};
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```
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### 自定义样式
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可以通过`active-icon`和`active-color`属性设置激活状态下的图标和颜色
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```html
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<van-steps :active="active" active-icon="success" active-color="#38f">
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<van-step>买家下单</van-step>
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<van-step>商家接单</van-step>
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<van-step>买家提货</van-step>
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<van-step>交易完成</van-step>
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</van-steps>
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```
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### 竖向步骤条
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可以通过设置`direction`属性来改变步骤条的显示方向
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```html
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<van-steps direction="vertical" :active="0">
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<van-step>
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<h3>【城市】物流状态1</h3>
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<p>2016-07-12 12:40</p>
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</van-step>
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<van-step>
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<h3>【城市】物流状态2</h3>
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<p>2016-07-11 10:00</p>
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</van-step>
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<van-step>
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<h3>快件已发货</h3>
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<p>2016-07-10 09:30</p>
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</van-step>
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</van-steps>
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```
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## API
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### Steps Props
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| 参数 | 说明 | 类型 | 默认值 |
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| --- | --- | --- | --- |
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| active | 当前步骤 | _number \| string_ | `0` |
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| direction | 显示方向,可选值为 `vertical` | _string_ | `horizontal` |
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| active-color | 激活状态颜色 | _string_ | `#07c160` |
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| active-icon | 激活状态底部图标,可选值见 [Icon 组件](#/zh-CN/icon) | _string_ | `checked` |
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| inactive-icon | 未激活状态底部图标,可选值见 [Icon 组件](#/zh-CN/icon) | _string_ | - |
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### Step Slots
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| 名称 | 说明 |
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| ------------- | -------------------- |
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| active-icon | 自定义激活状态图标 |
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| inactive-icon | 自定义未激活状态图标 |
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### Steps Events
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| 事件名 | 说明 | 回调参数 |
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| ------------------- | -------------------------- | --------------- |
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| click-step `v2.5.9` | 点击步骤的标题或图标时触发 | _index: number_ |
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