关于前端:使用递归-向数组中添加某字段

 created() {      this.addLevel(this.treeData); // 数组 }methods:{    addLevel (array, i = 1) {            let tableList = (arr, i) => {                arr.forEach(item => {                    item.level = i;                    if (item.children && item.children.length) {                        return this.addLevel(item.children, i + 1);                    }                });            };            return tableList(array, i);        },}