diff --git a/index2.html b/index2.html
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+<!DOCTYPE html>
+<!--[if lt IE 7]>      <html class="no-js lt-ie9 lt-ie8 lt-ie7"> <![endif]-->
+<!--[if IE 7]>         <html class="no-js lt-ie9 lt-ie8"> <![endif]-->
+<!--[if IE 8]>         <html class="no-js lt-ie9"> <![endif]-->
+<!--[if gt IE 8]>      <html class="no-js"> <!--<![endif]-->
+<html>
+  <head>
+    <meta charset="utf-8">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <title>Page Title</title>
+    <meta name="description" content="">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <link rel="stylesheet" href="">
+    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
+  </head>
+  <body>
+    <!--[if lt IE 7]>
+      <p class="browsehappy">You are using an <strong>outdated</strong> browser. Please <a href="#">upgrade your browser</a> to improve your experience.</p>
+    <![endif]-->
+    <div id="watch-example">
+      <p>
+        Ask a yes/no question: 
+        <input type="text" v-model="question">
+      </p>
+
+      <p>{{ answer }}</p>
+    </div>
+    
+    <script src="https://cdn.jsdelivr.net/npm/axios@0.12.0/dist/axios.min.js"></script>
+    <script src="https://cdn.jsdelivr.net/npm/lodash@4.13.1/lodash.min.js"></script>
+
+    <script>
+      var watchExampleVM = new Vue({
+      el: '#watch-example',
+      data: {
+        question: '',
+        answer: 'I cannot give you an answer until you ask a question!'
+      },
+      watch: {
+        // 如果 `question` 发生改变，这个函数就会运行
+        question: function (newQuestion, oldQuestion) {
+          this.answer = 'Waiting for you to stop typing...'
+          this.debouncedGetAnswer()
+        }
+      },
+      created: function () {
+        // `_.debounce` 是一个通过 Lodash 限制操作频率的函数。
+        // 在这个例子中，我们希望限制访问 yesno.wtf/api 的频率
+        // AJAX 请求直到用户输入完毕才会发出。想要了解更多关于
+        // `_.debounce` 函数 (及其近亲 `_.throttle`) 的知识，
+        // 请参考：https://lodash.com/docs#debounce
+        this.debouncedGetAnswer = _.debounce(this.getAnswer, 500)
+      },
+      methods: {
+        getAnswer: function () {
+          if (this.question.indexOf('?') === -1) {
+            this.answer = 'Questions usually contain a question mark. ;-)'
+            return
+          }
+          this.answer = 'Thinking...'
+          var vm = this
+          axios.get('https://yesno.wtf/api')
+            .then(function (response) {
+              vm.answer = _.capitalize(response.data.answer)
+            })
+            .catch(function (error) {
+              vm.answer = 'Error! Could not reach the API. ' + error
+            })
+        }
+      }
+    })
+      
+    </script>
+  </body>
+</html>
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