vue ---> modifier .lazy, .number, .trim

.lazy: will change into a synchronized event

<div id="app">
    <input type="text" v-model.lazy="message">
    <p>{{ message }}</p>
</div>
<script>
    const app = new Vue({
        el:'#app',
        data: {
            message: ''
        }
    })
</script>
// message并不实时改变,而是失去焦点或按回车时才更新

.number: convert the value of the input type Number

<div id="app>
    <input type="number" v-model.number="message">
    <p>{{ typeof message }}</p>
</div>
<script>
    const app = new Vue({
        el:'#app',
        data: {
            message: 123
        }
    })
</script>

.trim: filter out trailing spaces of input

<div id="app">
    <input type="text" v-model.trim="message">
    <p>{{ message }}</p>
</div>
<script>
    const app = new Vue({
        el:'#app',
        data:{
            message:''
        }
    })
</script>

Reference "Vue.js real" P63 ~ P64