Vue的watch監聽事件
相關Html:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>名稱案例</title>
<script src="../js/vue-2.4.0.js"></script>
</head>
<body>
<div id="app">
<input type="text" v-model="firstname" @keyup="getFullname">+
<input type="text" v-model="lastname" @keyup="getFullname">=
<input type="text" v-model="fullname">
</div>
<script>
var vm = new Vue({
el: "#app",
data: {
firstname: "",
lastname: "",
fullname: ""
},
methods: {
getFullname: function () {
// this.fullname = this.firstname+this.lastname;
}
},
watch: {
//使用這個可以監聽data中指定數據的變化,然后觸發watch中對應的function的處理
'firstname': function (newVal,oldVal) {
console.log((newVal + "--" + oldVal));
},
'lastname': function (newVal,oldVal) {
console.log((newVal + "--" + oldVal));
}
}
})
</script>
</body>
</html>