[Doc] update Vue.use usage

docs/markdown/en-US/cell.md

@@ -4,8 +4,7 @@
 ``` javascript
 import { Cell, CellGroup } from 'vant';
 
-Vue.use(Cell);
-Vue.use(CellGroup);
+Vue.use(Cell).use(CellGroup);
 ```
 
 ### Usage

docs/markdown/en-US/checkbox.md

@@ -4,8 +4,7 @@
 ``` javascript
 import { Checkbox, CheckboxGroup } from 'vant';
 
-Vue.use(Checkbox);
-Vue.use(CheckboxGroup);
+Vue.use(Checkbox).use(CheckboxGroup);
 ```
 
 ### Usage

docs/markdown/en-US/contact.md

@@ -4,9 +4,10 @@
 ``` javascript
 import { ContactCard, ContactList, ContactEdit } from 'vant';
 
-Vue.use(ContactCard);
-Vue.use(ContactList);
-Vue.use(ContactEdit);
+Vue
+  .use(ContactCard)
+  .use(ContactList)
+  .use(ContactEdit);
 ```
 
 ### Usage

docs/markdown/en-US/coupon.md

@@ -4,8 +4,7 @@
 ``` javascript
 import { CouponCell, CouponList } from 'vant';
 
-Vue.use(CouponCell);
-Vue.use(CouponList);
+Vue.use(CouponCell).use(CouponList);
 ```
 
 ### Usage

docs/markdown/en-US/goods-action.md

@@ -8,9 +8,10 @@ import {
   GoodsActionMiniBtn
 } from 'vant';
 
-Vue.use(GoodsAction);
-Vue.use(GoodsActionBigBtn);
-Vue.use(GoodsActionMiniBtn);
+Vue
+  .use(GoodsAction)
+  .use(GoodsActionBigBtn)
+  .use(GoodsActionMiniBtn);
 ```
 
 ### Usage

docs/markdown/en-US/layout.md

@@ -6,8 +6,7 @@ Quickly and easily create layouts with `van-row` and `van-col`
 ``` javascript
 import { Row, Col } from 'vant';
 
-Vue.use(Row);
-Vue.use(Col);
+Vue.use(Row).use(Col);
 ```
 
 ### Usage

docs/markdown/en-US/password-input.md

@@ -5,8 +5,7 @@ The PasswordInput component is usually used with [NumberKeyboard](#/en-US/compon
 ``` javascript
 import { PasswordInput, NumberKeyboard } from 'vant';
 
-Vue.use(PasswordInput);
-Vue.use(NumberKeyboard);
+Vue.use(PasswordInput).use(NumberKeyboard);
 ```
 
 ### Usage

docs/markdown/en-US/steps.md

@@ -4,8 +4,7 @@
 ``` javascript
 import { Step, Steps } from 'vant';
 
-Vue.use(Step);
-Vue.use(Steps);
+Vue.use(Step).use(Steps);
 ```
 
 ### Usage

docs/markdown/en-US/swipe.md

@@ -4,8 +4,7 @@
 ``` javascript
 import { Swipe, SwipeItem } from 'vant';
 
-Vue.use(Swipe);
-Vue.use(SwipeItem);
+Vue.use(Swipe).use(SwipeItem);
 ```
 
 ### Usage

docs/markdown/en-US/tab.md

@@ -4,8 +4,7 @@
 ``` javascript
 import { Tab, Tabs } from 'vant';
 
-Vue.use(Tab);
-Vue.use(Tabs);
+Vue.use(Tab).use(Tabs);
 ```
 
 ### Usage

docs/markdown/en-US/tabbar.md

@@ -4,8 +4,7 @@
 ``` javascript
 import { Tabbar, TabbarItem } from 'vant';
 
-Vue.use(Tabbar);
-Vue.use(TabbarItem);
+Vue.use(Tabbar).use(TabbarItem);
 ```
 
 ### Usage

docs/markdown/zh-CN/cell.md

@@ -4,8 +4,7 @@
 ``` javascript
 import { Cell, CellGroup } from 'vant';
 
-Vue.use(Cell);
-Vue.use(CellGroup);
+Vue.use(Cell).use(CellGroup);
 ```
 
 ### 代码演示

docs/markdown/zh-CN/checkbox.md

@@ -4,8 +4,7 @@
 ``` javascript
 import { Checkbox, CheckboxGroup } from 'vant';
 
-Vue.use(Checkbox);
-Vue.use(CheckboxGroup);
+Vue.use(Checkbox).use(CheckboxGroup);
 ```
 
 ### 代码演示

docs/markdown/zh-CN/contact.md

@@ -5,9 +5,10 @@
 ``` javascript
 import { ContactCard, ContactList, ContactEdit } from 'vant';
 
-Vue.use(ContactCard);
-Vue.use(ContactList);
-Vue.use(ContactEdit);
+Vue
+  .use(ContactCard)
+  .use(ContactList)
+  .use(ContactEdit);
 ```
 
 ### 代码演示

docs/markdown/zh-CN/coupon.md

@@ -4,8 +4,7 @@
 ``` javascript
 import { CouponCell, CouponList } from 'vant';
 
-Vue.use(CouponCell);
-Vue.use(CouponList);
+Vue.use(CouponCell).use(CouponList);
 ```
 
 ### 代码演示

docs/markdown/zh-CN/goods-action.md

@@ -8,9 +8,10 @@ import {
   GoodsActionMiniBtn
 } from 'vant';
 
-Vue.use(GoodsAction);
-Vue.use(GoodsActionBigBtn);
-Vue.use(GoodsActionMiniBtn);
+Vue
+  .use(GoodsAction)
+  .use(GoodsActionBigBtn)
+  .use(GoodsActionMiniBtn);
 ```
 
 ### 代码演示

docs/markdown/zh-CN/layout.md

@@ -6,8 +6,7 @@
 ``` javascript
 import { Row, Col } from 'vant';
 
-Vue.use(Row);
-Vue.use(Col);
+Vue.use(Row).use(Col);
 ```
 
 ### 代码演示

docs/markdown/zh-CN/password-input.md

@@ -5,8 +5,7 @@
 ``` javascript
 import { PasswordInput, NumberKeyboard } from 'vant';
 
-Vue.use(PasswordInput);
-Vue.use(NumberKeyboard);
+Vue.use(PasswordInput).use(NumberKeyboard);
 ```
 
 ### 代码演示

docs/markdown/zh-CN/steps.md

@@ -4,8 +4,7 @@
 ``` javascript
 import { Step, Steps } from 'vant';
 
-Vue.use(Step);
-Vue.use(Steps);
+Vue.use(Step).use(Steps);
 ```
 
 ### 代码演示

docs/markdown/zh-CN/swipe.md

@@ -4,8 +4,7 @@
 ``` javascript
 import { Swipe, SwipeItem } from 'vant';
 
-Vue.use(Swipe);
-Vue.use(SwipeItem);
+Vue.use(Swipe).use(SwipeItem);
 ```
 
 ### 代码演示

docs/markdown/zh-CN/tab.md

@@ -4,8 +4,7 @@
 ``` javascript
 import { Tab, Tabs } from 'vant';
 
-Vue.use(Tab);
-Vue.use(Tabs);
+Vue.use(Tab).use(Tabs);
 ```
 
 ### 代码演示

docs/markdown/zh-CN/tabbar.md

@@ -4,8 +4,7 @@
 ``` javascript
 import { Tabbar, TabbarItem } from 'vant';
 
-Vue.use(Tabbar);
-Vue.use(TabbarItem);
+Vue.use(Tabbar).use(TabbarItem);
 ```
 
 ### 代码演示

docs/src/examples.js

@@ -9,12 +9,13 @@ import 'packages/vant-css/src/icon-local.css';
 import 'vant-doc/src/helper/touch-simulator';
 import './components/nprogress.css';
 
-Vue.use(Vant);
-Vue.use(VantDoc);
-Vue.use(Lazyload, {
-  lazyComponent: true
-});
-Vue.use(VueRouter);
+Vue
+  .use(Vant)
+  .use(VantDoc)
+  .use(VueRouter)
+  .use(Lazyload, {
+    lazyComponent: true
+  });
 
 const routesConfig = routes(true);
 const router = new VueRouter({

docs/src/index.js

@@ -6,8 +6,7 @@ import VantDoc from 'vant-doc';
 import isMobile from './utils/is-mobile';
 import './components/nprogress.css';
 
-Vue.use(VueRouter);
-Vue.use(VantDoc);
+Vue.use(VueRouter).use(VantDoc);
 
 const routesConfig = routes();