js玩转树结构

1. 树结构转换成数组
   treeToArray(tree) {
   let arr = [];
   let expand = (tree) => {
   if(tree&&tree.length>0) {
   tree.forEach(el => {
   arr.push(el);
   expand(el.children);
   });
   }
   }
   return arr;
   }
   2.筛选树节点checked=true的数据
   filterArr(arr) {
   return arr.filter((item)=>{
   return item.checked === true;
   }).map((item)=>{
   item = Object.assign({},item);
   if(item.children&&item.children.length>0) {
   item.children = this.filterArr(item.children);
   }
   return item;
   })
   }