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Vue的watch監聽事件

lln 觸發 doctype new mode last 變化 char ext

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,然後觸發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>

Vue的watch監聽事件