Vue中对数组变化监听

<script>
    export default {
        data() {
            return {
                comments: [],
                isReply: [0, 0, 0, 0, 0]
            };
        },
        methods: {
            replyTo: function (index) {
                console.log(this.isReply);
                isReply[index] = 1
                console.log(this.isReply);
            }
        },
    };
</script>

<script>
    export default {
        data() {
            return {
                comments: [],
                isReply: [0, 0, 0, 0, 0]
            };
        },
      watch: {
        isReply: {
          handler(val, oldval) {

          },
          deep: true
        }
      },
        methods: {
            replyTo: function (index) {
                console.log(this.isReply);
                isReply[index] = 1
                console.log(this.isReply);
            }
        },
    };
</script>

// Vue.set
Vue.set(vm.items, indexOfItem, newValue)

// Array.prototype.splice
vm.items.splice(indexOfItem, 1, newValue)

<script>
    import Comment from '../components/Comment'

    export default {
        data() {
            return {
                comments: [],
                isReply: [0, 0, 0, 0, 0]
            };
        },
        watch: {

        },
        components: {
            Comment
        },
        methods: {
            replyTo: function (index) {
				
				// 最后一个参数为我们需要改变的值
                this.isReply.splice(index, 1, 1);

                this.$set(this.isReply, index, 1);

            }
        },
    };
</script>