vue修改数组元素方法

示例代码

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

    <head>
        <meta charset="UTF-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <meta http-equiv="X-UA-Compatible" content="ie=edge" />
        <title>vue修改数组元素方法</title>
    </head>

    <body>
        <div id="root">
            <div v-for="item in arr">
                {{ item }}
            </div>
            <button @click="changeArr1">修改数组元素方法--方法一</button>
            <button @click="changeArr2">修改数组元素方法--方法二</button>
            <button @click="changeArr3">修改数组元素方法--方法三</button>
        </div>
        <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>

        <script type="text/javascript">
            var vm = new Vue({
                el: '#root',
                data: {
                    arr: [1, 2, 3]
                },
                methods: {
                    changeArr1: function() {
                        Vue.set(vm.arr, 0, '方法一');
                    },
                    changeArr2: function() {
                        vm.$set(vm.arr, 0, '方法二');
                    },
                    changeArr3: function() {
                        this.arr.splice(0, 1, '方法三');
                        //vm.arr.splice(0,1,'方法三');
                    }
                }
            });
        </script>
    </body>

</html>