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watch实现 ​

html
<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Vue</title>
    <script src="https://lf3-cdn-tos.bytecdntp.com/cdn/expire-1-M/vue/2.6.14/vue.js"
        type="application/javascript"></script>
</head>

<body>
    <div id="root">
        <h2>人员列表</h2>
        <input type="text" placeholder="请输入姓名" v-model="keyWord">
       <ul>
        <li v-for="(p,index) in filPer" :key="index">{{p.name}} - {{p.age}} - {{p.sex}}</li>
       </ul>
    </div>
    <script>
        Vue.config.productionTip = false;
        const vm = new Vue({
            el: '#root',
            data: {
                name: 'Vue',
                keyWord:'',
                filPer:[],
                persons:[
                    {id:'001', name:'马冬梅', age:22, sex:'女'},
                    {id:'002', name:'周冬雨', age:33, sex:'女'},
                    {id:'003', name:'周杰伦', age:43, sex:'男'},
                    {id:'004', name:'温兆伦', age:32, sex:'男'}
                ]
            },
            // indexOf 搜索一个空字符串时索引是0
            watch: {
                keyWord:{
                    immediate:true,
                    handler(val){
                        this.filPer = this.persons.filter((p)=>{
                            return p.name.indexOf(val) !== -1
                        })
                }
                }
            },
            methods: {
            }
        })
    </script>
</body>

</html>

conputed实现 ​

html
<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Vue</title>
    <script src="https://lf3-cdn-tos.bytecdntp.com/cdn/expire-1-M/vue/2.6.14/vue.js"
        type="application/javascript"></script>
</head>

<body>
    <div id="root">
        <h2>人员列表</h2>
        <input type="text" placeholder="请输入姓名" v-model="keyWord">
       <ul>
        <li v-for="(p,index) in filPer" :key="index">{{p.name}} - {{p.age}} - {{p.sex}}</li>
       </ul>
    </div>
    <script>
        Vue.config.productionTip = false;
        const vm = new Vue({
            el: '#root',
            data: {
                name: 'Vue',
                keyWord:'',
                persons:[
                    {id:'001', name:'马冬梅', age:22, sex:'女'},
                    {id:'002', name:'周冬雨', age:33, sex:'女'},
                    {id:'003', name:'周杰伦', age:43, sex:'男'},
                    {id:'004', name:'温兆伦', age:32, sex:'男'}
                ]
            },
            computed: {
                filPer(){
                    return this.persons.filter((p)=>{
                        return p.name.indexOf(this.keyWord) !== -1
                    })
                }
            }
        })
    </script>
</body>

</html>