[Improvement] Reorganize document (#1066)

packages/submit-bar/en-US.md

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+## SubmitBar
+
+### Install
+``` javascript
+import { SubmitBar } from 'vant';
+
+Vue.use(SubmitBar);
+```
+
+### Usage
+
+#### Basic Usage
+
+```html
+<van-submit-bar
+  :price="3050"
+  button-text="Submit"
+  @submit="onSubmit"
+/>
+```
+
+#### Disabled
+`submit` event will not triggerd when disabled.
+
+```html
+<van-submit-bar
+  disabled
+  :price="3050"
+  button-text="Submit"
+  tip="Some tips"
+  @submit="onSubmit"
+/>
+```
+
+#### Loading
+`submit` event will not triggerd when loading.
+
+```html
+<van-submit-bar
+  loading
+  :price="3050"
+  button-text="Submit"
+  @submit="onSubmit"
+/>
+```
+
+#### Advanced Usage
+Use slot to add custom contents.
+
+```html
+<van-submit-bar
+  :price="3050"
+  button-text="Submit"
+  @submit="onSubmit"
+>
+  <van-checkbox v-model="checked">Check</van-checkbox>
+  <span slot="tip">
+    Some tips, <span @click="onClickEditAddress">Link</span>
+  </span>
+</van-submit-bar>
+```
+
+### API
+
+| Attribute | Description | Type | Default |
+|-----------|-----------|-----------|-------------|
+| price | Price |  `Number` | - |
+| label | Price label |  `String` | `合计：` |
+| button-text | Button text | `String` | - |
+| button-type | Button type |  `String` | `danger` |
+| tip | Tip |  `String` | - |
+| disabled | Whether to disable button |  `Boolean` | `false` |
+| loading | Whether to show loading icon |  `Boolean` | `false` |
+| currency | Currency symbol |  `String` | `¥` |
+
+### Event
+
+| Event | Description | Arguments |
+|-----------|-----------|-----------|
+| submit | Triggerd when click submit button | - |
+
+### Slot
+
+| Name | Description |
+|-----------|-----------|
+| default | Custom left content |
+| tip | Custom tips |

packages/submit-bar/zh-CN.md

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+## SubmitBar 提交订单栏
+
+### 使用指南
+``` javascript
+import { SubmitBar } from 'vant';
+
+Vue.use(SubmitBar);
+```
+
+### 代码演示
+
+#### 基础用法
+
+```html
+<van-submit-bar
+  :price="3050"
+  button-text="提交订单"
+  @submit="onSubmit"
+/>
+```
+
+#### 禁用状态
+禁用状态下不会触发`submit`事件
+
+```html
+<van-submit-bar
+  disabled
+  :price="3050"
+  button-text="提交订单"
+  tip="您的收货地址不支持同城送, 我们已为您推荐快递"
+  @submit="onSubmit"
+/>
+```
+
+#### 加载状态
+加载状态下不会触发`submit`事件
+
+```html
+<van-submit-bar
+  loading
+  :price="3050"
+  button-text="提交订单"
+  @submit="onSubmit"
+/>
+```
+
+#### 高级用法
+通过 slot 插入自定义内容
+
+```html
+<van-submit-bar
+  :price="3050"
+  button-text="提交订单"
+  @submit="onSubmit"
+>
+  <van-checkbox v-model="checked">全选</van-checkbox>
+  <span slot="tip">
+    您的收货地址不支持同城送, <span>修改地址</span>
+  </span>
+</van-submit-bar>
+```
+
+### API
+
+| 参数 | 说明 | 类型 | 默认值 |
+|-----------|-----------|-----------|-------------|
+| price | 价格（单位分） |  `Number` | - |
+| label | 价格文案 |  `String` | `合计：` |
+| button-text | 按钮文字 | `String` | - |
+| button-type | 按钮类型 |  `String` | `danger` |
+| tip | 提示文案 |  `String` | - |
+| disabled | 是否禁用按钮 |  `Boolean` | `false` |
+| loading | 是否显示加载中的按钮 |  `Boolean` | `false` |
+| currency | 货币符号 |  `String` | `¥` |
+
+### Event
+
+| 事件名 | 说明 | 参数 |
+|-----------|-----------|-----------|
+| submit | 按钮点击事件回调 | - |
+
+### Slot
+
+| 名称 | 说明 |
+|-----------|-----------|
+| default | 自定义订单栏左侧内容 |
+| tip | 提示文案中的额外操作和说明 |