<input v-model:"msg" placeholder="edit me"/>

<textarea name="" id="" cols="30" rows="10" v-model:"msg"></textarea>

<input type="checkbox" value="看电影" v-model="checked"/>
<input type="checkbox" value="打游戏" v-model="checked"/>
<input type="checkbox" value="音乐" v-model="checked"/>
{{ checked }} 

var vm=new Vue({
   el:'#app',
   date:{
    checked:[]
   }, 

<input type="radio" value="男" v-model="picked"/>男
<input type="radio" value="女" v-model="picked"/>女
{{picked}} 

var vm=new Vue({
 el:'#app',
 date:{
  picked: ''
 },

 <select v-model="selected">
 <option disabled value="">请选择</option>
 <option>河北</option>
 <option>山西</option>
 <option>北京</option> 
 </select>
{{ selected }} 

var vm=new Vue({
 el:'#app',
 date:{
  selected:'',
 }, 

<div id="example-6">
 <select v-model="selected" multiple style="width: 50px">
 <option>A</option>
 <option>B</option>
 <option>C</option>
 </select>
 <br>
 <span>Selected: {{ selected }}</span>
</div> 
new Vue({
 el: '#example-6',
 data: {
 selected: []
 }
}) 

<!-- 当选中时，`picked` 为字符串 "a" -->
<input type="radio" v-model="picked" value="a">
<!-- `toggle` 为 true 或 false -->
<input type="checkbox" v-model="toggle">
<!-- 当选中时，`selected` 为字符串 "abc" -->
<select v-model="selected">
 <option value="abc">ABC</option>
</select> 

<input
 type="checkbox"
 v-model="toggle"
 v-bind:true-value="a"
 v-bind:false-value="b"
> 

// 当选中时
vm.toggle === vm.a
// 当没有选中时
vm.toggle === vm.b

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

// 当选中时
vm.pick === vm.a 

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

// 当选中时
typeof vm.selected // => 'object'
vm.selected.number // => 123 

 {{msg}}
<input type="text" v-model.lazy:"msg"/> 

{{num1}}
<input type="text" v-model.number:"num1"/> 
{{num2}}
<input type="text" v-model.number:"num2"/> 

{{num1+num2}} 

var vm=new Vue({
 date:{
  num1:1,
  num2:1
 },
}); 

 {{msg}}
<input type="text" v-model.lazy.trim:"msg"/>