<! DOCTYPE HTML>
<HTML lang = "EN">
<head>
<Meta charset = "UTF-. 8">
<Meta name = "the viewport" Content = "width = Device-width, Initial-Scale = 1.0">
< HTTP-equiv = Meta "X--the UA-Compatible" Content = "IE = Edge">
<title> the Document </ title>
<Script the src = "./ lib / VUE-2.4.0.js"> </ Script>
</ head>
<body>
<div the above mentioned id = "App">
<- analysis:! ->
<! - 1. we want to listen to the text box to change the data, so as to know when to piece together a fullname ->
<! - 2. how to monitor data changes in the text box it? ? ? ->
<INPUT type = "text" = V-Model "FirstName" @ keyUp = "GetFullName">
// 创建 Vue 实例，得到 ViewModel
var vm = new Vue({
el: '#app',
data: {
firstname: '',
lastname: '',
fullname: ''
},
methods: {
getFullname() {
this.fullname = this.firstname + '-' + this.lastname
}
}
});
</script>
</body>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script src="./lib/vue-2.4.0.js"></script>
</head>
<body>
<div id="app">
<input type="text" v-model="firstname"> +
<input type="text" v-model="lastname"> =
<input type="text" v-model="fullname">
</div>
<script>
'#app'
EL:Vue ({new new=VMvarCreate Vue instance, to give the ViewModel//
,
Data: {
FirstName: '' ,
LastName: '' ,
FullName: ''
},
Methods: {},
watch: { // use this property, can monitor the change in data specified in the data, then this triggers a corresponding watch function handler
' firstname ' : function (newVal, oldVal) {
// the console.log ( 'monitored the change in the firstname')
// this.fullname = this.firstname + '-' + this.lastname
// the console.log (+ newVal '---' + oldVal)
the this .fullname = newVal + '-' + this.lastname
},
'lastname': function (newVal) {
this.fullname = this.firstname + '-' + newVal
}
}
});
</script>
</body>
</html>