docs: complete some examples of button/cell/checkbox/radio

src/button/README.md

@@ -89,6 +89,11 @@ Vue.use(Button);
 <van-button color="linear-gradient(to right, #4bb0ff, #6149f6)">Gradient</van-button>
 ```
 
+### Block Element
+```html
+<van-button type="primary" block>Display as a block element</van-button>
+```
+
 ## API
 
 ### Props

src/button/README.zh-CN.md

@@ -109,6 +109,15 @@ Vue.use(Button);
 <van-button color="linear-gradient(to right, #4bb0ff, #6149f6)">渐变色按钮</van-button>
 ```
 
+### 块级元素按钮
+
+通过`block`属性可以设置按钮的元素类型
+
+```html
+<van-button type="primary" block>块级元素按钮</van-button>
+```
+
+
 ## API
 
 ### Props

src/button/demo/index.vue

@@ -64,6 +64,13 @@
       <van-button plain color="#7232dd" :text="$t('pure')" />
       <van-button color="linear-gradient(to right, #4bb0ff, #6149f6)" :text="$t('gradient')" />
     </demo-block>
+
+    <demo-block :title="$t('blockElement')">
+      <div class="demo-button-row">
+        <van-button type="primary">{{ $t('normal') }}</van-button>
+      </div>
+      <van-button type="primary" block>{{ $t('blockElement') }}</van-button>
+    </demo-block>
   </demo-section>
 </template>
 
@@ -96,7 +103,8 @@ export default {
       vueRoute: '路由跳转',
       customColor: '自定义颜色',
       pure: '单色按钮',
-      gradient: '渐变色按钮'
+      gradient: '渐变色按钮',
+      blockElement: '块级元素按钮'
     },
     'en-US': {
       type: 'Type',
@@ -124,7 +132,8 @@ export default {
       vueRoute: 'Vue Router',
       customColor: 'Custom Color',
       pure: 'Pure',
-      gradient: 'Gradient'
+      gradient: 'Gradient',
+      blockElement: 'Display as a block element'
     }
   }
 };

src/button/test/__snapshots__/demo.spec.js.snap

@@ -23,5 +23,8 @@ exports[`renders demo correctly 1`] = `
   <div><button class="van-button van-button--primary van-button--large"><span class="van-button__text">大号按钮</span></button> <button class="van-button van-button--primary van-button--normal"><span class="van-button__text">普通按钮</span></button> <button class="van-button van-button--primary van-button--small"><span class="van-button__text">小型按钮</span></button> <button class="van-button van-button--primary van-button--mini"><span class="van-button__text">迷你按钮</span></button></div>
   <div><button class="van-button van-button--primary van-button--normal"><span class="van-button__text">URL 跳转</span></button> <button class="van-button van-button--primary van-button--normal"><span class="van-button__text">路由跳转</span></button></div>
   <div><button class="van-button van-button--default van-button--normal" style="color: rgb(255, 255, 255); background: rgb(114, 50, 221); border-color: #7232dd;"><span class="van-button__text">单色按钮</span></button> <button class="van-button van-button--default van-button--normal van-button--plain" style="color: rgb(114, 50, 221); border-color: #7232dd;"><span class="van-button__text">单色按钮</span></button> <button class="van-button van-button--default van-button--normal" style="color: rgb(255, 255, 255); border: 0px;"><span class="van-button__text">渐变色按钮</span></button></div>
+  <div>
+    <div class="demo-button-row"><button class="van-button van-button--primary van-button--normal"><span class="van-button__text">普通按钮</span></button></div> <button class="van-button van-button--primary van-button--normal van-button--block"><span class="van-button__text">块级元素按钮</span></button>
+  </div>
 </div>
 `;