js多层数组的Filter过滤

    // 搜索框过滤
  function searchFilter(list, key, num, prevList) {
        for (let i = list.length - 1; i >= 0; i--) {
            let item = list[i]
            if (item.children && Array.isArray(item.children) && item.children.length > 0) {
                searchFilter(item.children, key, i, list);
            } else {
                if (item.title && !item.title.includes(key)) {
                  list.splice(i, 1)
                }
            }
        }
        if (Array.isArray(list) && list.length == 0) {
          if(prevList && num){
            prevList.splice(num, 1)
          }
        }
    }

//调用
searchFilter(list,key)