前端-vue基础37-侦听器开始

 

<!DOCTYPE html>
<html lang="en">
 
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
 
<body>
    <div id="app">
        <div>
            <span>名:</span>
            <span>
            <input type="text" v-model='firstName'>
        </span>
        </div>
        <div>
            <span>姓:</span>
            <span>
            <input type="text" v-model='lastName'>
        </span>
        </div>
        <div>{{fullName}}</div>
    </div>
    <script type="text/javascript" src="./js/vue.js"></script>
    <script>
        /* 侦听器 */
        var vm = new Vue({
            el: '#app',
 
            data: {
                firstName: 'Jim',
                lastName: 'Green',
                fullName: 'Jim Green'
            },
            computed: {
                fullName: function() {
                    return this.firstName + ' ' + this.lastName;
                }
            },
            watch: {
                firstName: function(val) {
                    this.fullName = val + ' ' + this.lastName;
                },
                lastName: function(val) {
                    this.fullName = this.firstName + ' ' + val;
                }
            }
 
        })
    </script>
</body>
 
</html>

posted @ 2022-07-23 22:30  前端导师歌谣  阅读(22)  评论(0)    收藏  举报