<div id="app-1">
 <button v-on:click="counter += 1">增加1</button>
 <p>这个按钮被点击了{{counter}}</p>
 <button v-on:click="great">great</button>
 <button @click="sya('hi')">say hi</button>
 <button @click="warn('form cannot be submit yet', $event)">submit</button>
</div>
<script type="text/javascript">
 var app1 = new Vue({
 el:'#app-1',
 data:{
 counter:0
 },
 methods:{
 great:function(event){
 alert('点击数目为'+ this.counter);
 alert(event.target.tagName);
 },
 sya:function(message){
 alert(message);
 },
 warn:function(msg,event){
 if(event) event.preventDefault();
 alert(msg);
 }
 }
 })
</script>

<div id="app2">
<!-- 阻止单击事件冒泡 -->
<a v-on:click.stop="doThis"></a>
<!-- 提交事件不再重载页面 -->
<form v-on:submit.prevent="onSubmit"></form>
<!-- 修饰符可以串联 -->
<a v-on:click.stop.prevent="doThat"></a>
<!-- 只有修饰符 -->
<form v-on:submit.prevent></form>
<!-- 添加事件侦听器时使用时间捕获模式 -->
<div v-on:click.capture="doThis">...</div>
<!-- 只当事件在该元素本身（而不是子元素）触发时触发回调 -->
<div v-on:click.self="doThat">...</div>
</div>

<!-- 只有在 keyCode 是 13 时调用 vm.submit() -->
<input v-on:keyup.13="submit">

<!-- 同上 -->
<input v-on:keyup.enter="submit">
<!-- 缩写语法 -->
<input @keyup.enter="submit">

// 可以使用 v-on:keyup.f1
Vue.config.keyCodes.f1 = 112

//文本
<input type="text" v-model="message" placeholder="edit it">
<p>this message is {{message}}</p>
<hr>
//多行文本
<span>Multiline message is:</span>
<p style="white-space: pre">{{ message }}</p>
<br>
<textarea v-model="message" placeholder="add multiple lines"></textarea>
<hr>
//复选框
<input type="checkbox" id="checkbox" v-model="checked">
<label for="checkbox">{{ checked }}</label>
<hr>
<input type="checkbox" id="jack" value="Jack" v-model="checkedNames">
<label for="jack">Jack</label>
<input type="checkbox" id="john" value="John" v-model="checkedNames">
<label for="john">John</label>
<input type="checkbox" id="mike" value="Mike" v-model="checkedNames">
<label for="mike">Mike</label>
<br>
<span>Checked names数组: {{ checkedNames }}</span>
<hr>
//单选按钮
<input type="radio" id="one" value="One" v-model="picked">
<label for="one">One</label>
<br>
<input type="radio" id="two" value="Two" v-model="picked">
<label for="two">Two</label>
<br>
<span>Picked: {{ picked }}</span>
<hr>
//选择列表
<select v-model="selected">
 <option>A</option>
 <option>B</option>
 <option>C</option>
</select>
<span>Selected: {{ selected }}</span>
<hr>
<select v-model="mulselected" multiple>
 <option>A</option>
 <option>B</option>
 <option>C</option>
</select>
<br>
<span>Selected数组: {{ mulselected }}</span>

<input
 type="checkbox"
 v-model="toggle"
 v-bind:true-value="a"
 v-bind:false-value="b">
<p>toggle的值为{{toggle}}</p>

<input type="radio" v-model="pick" v-bind:value="a">

<select v-model="selected">
 <!-- 内联对象字面量 -->
 <option v-bind:value="{ number: 123 }">123</option>
</select>

<input v-model.lazy="msg" >

<input v-model.number="age" type="number">

<input v-model.lazy.trim="msg" >