递归注意事项

正确的：

handelMultiSelectResFactorial(nodes) {
      for (let i = 0, length = nodes.length; i < length; i++) {
        if (nodes[i]?.children?.length) {
          return this.handelMultiSelectResFactorial(nodes[i].children);
        }
        return nodes[i];
      }
    },

一个可以终止的for循环

for (let i = 0; ; i++) {
     nodeIds.push(res[i].ID);
     if (i === this.maxCheckNum - 1) {
          break;
         }
}

function testBreak(x) {
  var i = 0;

  while (i < 6) {
    if (i == 3) {
      break;
    }
    i += 1;
  }

  return i * x;
}

并没有按照想要结果进行退出，错误的demo:

let res = [
  {
    ID: 'site_1',
    children: [
      {
        ID: 'area_1',
        children: [
          {
            ID: 'shop_9',
          },
        ],
      },
      { ID: 'shop_1' },
      { ID: 'shop_2' },
      { ID: 'shop_3' },
    ],
  },
]
function handleRes(nodes) {
  for (let i = 0, length = nodes.length; i < length; i++) {
    if (nodes[i]?.children?.length) {
      console.log(nodes[i].children)
       handleRes(nodes[i].children)  //导致了闭包，然后就不会正常的按照预料的去执行
    } else {
      return nodes[i]
    }
  }
}
let a = handleRes(res)
console.log('结果', a)


// 其实是会退出的
for (let index = 0; index < 6; index++) {
  console.log(index)
  if (index > 3) {
    return
  }
}


handelMultiSelectResFactorial(nodes) {
      for (let i = 0, length = nodes.length; i < length; i++) {
        if (nodes[i]?.children?.length) {
           this.handelMultiSelectResFactorial(nodes[i].children); // 闭包
        }else {
           return nodes[i];  // 甚至还加了break，还是无法退出
        }
      }
    },