docs(zh): updated to #1576284 (#1006)

Author: Jinjiang

docs/zh/guides/dom-events.md

@@ -37,19 +37,22 @@ wrapper.trigger('click', { button: 0 })
 
 ```html
 <template>
-<div>
-  <button class="yes" @click="callYes">Yes</button>
-  <button class="no" @click="callNo">No</button>
-</div>
+  <div>
+    <button class="yes" @click="callYes">Yes</button>
+    <button class="no" @click="callNo">No</button>
+  </div>
 </template>
+
 <script>
 export default {
   name: 'YesNoComponent',
+
   props: {
     callMe: {
       type: Function
     }
   },
+
   methods: {
     callYes() {
       this.callMe('yes')
@@ -60,7 +63,6 @@ export default {
   }
 }
 </script>
-
 ```
 
 **测试**
@@ -93,8 +95,9 @@ describe('点击事件', () => {
 
 ```html
 <template>
-<input type="text" @keydown.prevent="onKeydown" v-model="quantity" />
+  <input type="text" @keydown.prevent="onKeydown" v-model="quantity" />
 </template>
+
 <script>
 const KEY_DOWN = 40
 const KEY_UP = 38
@@ -107,6 +110,7 @@ export default {
       quantity: 0
     }
   },
+
   methods: {
     increment() {
       this.quantity += 1
@@ -132,14 +136,14 @@ export default {
       }
     }
   },
+
   watch: {
     quantity: function (newValue) {
       this.$emit('input', newValue)
     }
   }
 }
 </script>
-
 ```
 
 **Test**
@@ -182,7 +186,6 @@ describe('键盘事件测试', () => {
     expect(wrapper.vm.quantity).toBe(13)
   })
 })
-
 ```
 
 **限制**

docs/zh/guides/testing-async-components.md

@@ -20,22 +20,22 @@ export default {
 </template>
 
 <script>
-  import axios from 'axios'
-
-  export default {
-    data () {
-      return {
-        value: null
-      }
-    },
-
-    methods: {
-      async fetchResults () {
-        const response = await axios.get('mock/service')
-        this.value = response.data
-      }
+import axios from 'axios'
+
+export default {
+  data () {
+    return {
+      value: null
+    }
+  },
+
+  methods: {
+    async fetchResults () {
+      const response = await axios.get('mock/service')
+      this.value = response.data
     }
   }
+}
 </script>
 ```
 

docs/zh/guides/testing-single-file-components-with-karma.md

@@ -138,7 +138,7 @@ Woohoo，我们的测试跑起来了！
 npm install --save-dev karma-coverage cross-env
 ```
 
-我们会使用 `cross-env` 来设置一个 `BABEL_ENV` 环境变量。这样我们就可以在编译测试的时候使用 `babel-plugin-istanbul`——因为我们不想在生产环境下引入 `babel-plugin-istnabul`：
+我们会使用 `cross-env` 来设置一个 `BABEL_ENV` 环境变量。这样我们就可以在编译测试的时候使用 `babel-plugin-istanbul`——因为我们不想在生产环境下引入 `babel-plugin-istanbul`：
 
 ```
 npm install --save-dev babel-plugin-istanbul

docs/zh/guides/testing-single-file-components-with-mocha-webpack.md

@@ -124,10 +124,10 @@ global.expect = require('expect')
 
 ``` html
 <template>
-	<div>
-	  {{ count }}
-	  <button @click="increment">自增</button>
-	</div>
+  <div>
+    {{ count }}
+    <button @click="increment">自增</button>
+  </div>
 </template>
 
 <script>