题解 | #根据包名，在指定空间中创建对象#

递归数组

function setObj(obj, list, index) {
  const key = list[index]
  obj[key] = obj[key] ? Object.assign({}, obj[key]) : {}
  if(index < list.length) {
    setObj(obj[key], list, index + 1)
  }
}
  
function namespace(oNamespace, sPackage) {
  const list = sPackage.split('.')
  setObj(oNamespace, list, 0)
  return oNamespace
}