在watch生命周期里 获取的this.serviceList 不是正常的数组。
我需要改变 serviceList.child 的checked 值，该如何做？

    export default {
        props: ["list"],
        data() {
            return {
                serviceList: []
            }
        },
        mounted() {
            common.ajaxGet(common.api + "/service/categorys", {
                    pageSize: 10000
                })
                .then(data => {
                    if (data.code == 200) {
                        console.log("tip2 =>", data.data);
                        $.each(data.data, (i, iObj) => {
                            if (iObj.isEnabled) {
                                let services = {
                                    id: iObj.id,
                                    name: iObj.name,
                                    child: []
                                }
                                if (iObj.servers.length > 0) {
                                    $.each(iObj.servers, (j, jObj) => {
                                        if (jObj.isEnabled) {
                                            let temp = {
                                                id: jObj.id,
                                                name: jObj.name,
                                                price: jObj.price,
                                                categoryId: jObj.categoryId,
                                                categoryName: iObj.name,
                                                checked: false
                                            }
                                            services.child.push(temp);
                                        }
                                    });
                                }
                                this.serviceList.push(services);
                            }
                        });
                    }
                });
        },
        watch: {
            list(val) {
                let idList = val.map(obj => obj.id);
                console.log("idList", idList, this.serviceList);
                   //此处 this.serviceList 获取的不是数组，不知道如何循环
            }
        }
    }