列表渲染

1、案例1

<!DOCTYPE html>
<html>

<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>列表渲染</title>
</head>

<body>
    <div id="app">
        <!--在v-for里使用数组-->
        <ul>
            <li v-for="(item,index) in persons">
                {{item.name}}---{{item.age}}---{{item.address}}---{{index}}---
                <button @click="deleteFunc(index)">删除</button>
                <button @click="updateFunc(index,{name:'xiaofang',age:16,address:'安陆'})">更新</button>
            </li>
        </ul>
        <!--在v-for里使用对象-->
        <ul>
            <li v-for="(value,key) in person">
                {{key}}---{{value}}
            </li>
        </ul>
    </div>
    <script src="../js/vue.js" type="text/javascript"></script>
    <script>
        /*
        vue只是监视了数组persons,默认对其里面的对象的改变并没有监视。
        数组更新检测:
        Vue将被侦听的数组的变异方法进行了包裹,所以它们也将会触发视图更新。
        这些被包裹过的方法包括:
        push()
        pop()
        shift()
        unshift()
        splice()
        sort()
        reverse()
        */
        const vm = new Vue({
            el: "#app",
            data: {
                persons: [
                    { "name": "liuyang", "age": 18, "address": "湖北" },
                    { "name": "zhangsan", "age": 28, "address": "广东" },
                    { "name": "xiaoming", "age": 19, "address": "北京" }
                ],
                person: { "name": "xiaoming", "age": 19, "address": "北京" }
            },
            methods: {
                deleteFunc(idx) {
                    //删除下标为idx的元素
                    this.persons.splice(idx, 1);
                },
                updateFunc(idx, newPerson) {
                    //删除下标为idx的元素,并在原来位置插入新元素
                    this.persons.splice(idx, 1, newPerson);
                }
            }
        });
    </script>
</body>

</html>
原文地址:https://www.cnblogs.com/liuyang-520/p/12451832.html