有大佬遇到过这个问题吗：JavaScript求一返回方法感激不尽

Question

functionreturnIt(code){//returnobj}通过已知value（编码）返回对象e.g.returnIt('000003');返回{value:'000003',label:'渭南市',isLeaf:true}constcityList=[{label:'全国',value:'000000',children:[{label:'陕西省',value:'000001',children:[{value:'000002',label:'西安市',isLeaf:true},{value:'000003',label:'渭南市',isLeaf:true},],},{label:'上海',value:'000005',isLeaf:true},{label:'北京',value:'000006',isLeaf:true},{label:'河南省',value:'000007',children:[{value:'000008',label:'信阳',isLeaf:true},{value:'000009',label:'周口',isLeaf:true},{value:'000010',label:'其他',isLeaf:true},],},{label:'山东省',value:'000011',children:[{value:'000012',label:'枣庄',isLeaf:true},{value:'000013',label:'烟台',isLeaf:true},{value:'000014',label:'淄博',isLeaf:true},],},]}];

Answer 1

简单递归一下就行了
functionreturnIt(code,list){
for(letitemoflist){
if(item.value===code)returnitem;
if(item.children){
constchild=returnIt(code,item.children);
if(child)returnchild;
}
}
}
因为是纯函数，调用需把cityList作为参数传递进去
constresult=returnIt('000003',cityList);
console.log(result);
                            

Answer 2

functiongetReturnIt(arr,value){
letnewarr=arr;
letcurr=null;
while(newarr.length>0){
curr=newarr.shift();
if(value===curr.value){
returncurr
}
if(curr.children){
newarr.push(...curr.children)
}
}
}
console.log(getReturnIt(cityList,'000008'))