VUE框架计算属性初始

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="vue3.js"></script>

</head>
<body>

<div id="app">

    <table border="1">
        <tr>
            <td>序号</td>
            <td>书籍名称</td>
            <td>书籍价格</td>
        </tr>

        <tr  v-for="(book,index) in filterBook2">
            <template v-if="book.price>200">
                    <td>{{index}}</td>
                    <td>{{book.title}}</td>
                    <td>{{book.price}}</td>
            </template>

        </tr>

    </table>
        <p>方法: {{yyy()}}</p>
        <p>计算属性: {{xxx}}</p>
        <p>filterBook2: {{filterBook2}}</p>

</div>

<script>

    // 数据驱动界面
    var vm = Vue.createApp({
        data(){
            return {
                books: ["西游记","水浒传","三国演义","红楼梦"],
                books2: [
                    {title: "西游记", price: 199},
                    {title: "水浒传", price: 299},
                    {title: "三国演义", price: 399},
                    {title: "红楼梦", price: 499}
                ]
            }
        },
        methods: {
            yyy(){
                return 200
            }
        },
        computed: {
            xxx(){
                return 100
            },
            filterBook2(){
                return this.books2.filter(function (item) {
                    if(item.price>200){
                        return item
                    }
                })
            }
        },
    }).mount("#app")

</script>

</body>
</html>